- Mass comparison
Mass comparison is a method developed by Joseph Greenberg to determine the level of genetic relatedness between languages. It is now usually called multilateral comparison. The method is generally rejected by linguists (Campbell 2001, p. 45), though it has some supporters.
In spite of widespread skepticism about his method, some of the relationships established by Greenberg gradually came to be generally accepted (e.g. Afro-Asiatic and Niger–Congo). Others are widely accepted though disputed by some (e.g. Nilo-Saharan), others are predominantly rejected but have some defenders (e.g. Khoisan), while others continue to be widely rejected and have only a handful of defenders (e.g. Amerind).
The application of mass comparison led Greenberg not only to propose novel classifications but to break apart previously accepted ones. The best-known example is his rejection of the Hamitic language family.
- 1 Theory of mass comparison
- 2 The myth of ‘mass lexical comparison’
- 3 The disputed legacy of the comparative method
- 4 The mathematics of language comparison
- 5 Toward a resolution of the conflict?
- 6 Bibliography
- 7 External links
- 8 References
Theory of mass comparison
Mass comparison involves setting up a table of basic vocabulary items and their forms in the languages to be compared. The table can also include common morphemes. The following table was used by Greenberg (1957, p. 41) to illustrate the technique. It shows the forms of six items of basic vocabulary in nine different languages, identified by letters.
A B C D E F G H I Head kar kar se kal tu tu to fi pi Eye min ku min miŋ min aš min idi iri Nose tor tör ni tol was waš was ik am One mit kan kan kaŋ ha kan kεn he čak Two ni ta ne kil ne ni ne gum gun Blood kur sem sem šam i sem sem fik pix
The basic relationships can be determined without any experience in the case of languages that are fairly closely related. Knowing a bit about probable paths of sound change allows one to go farther faster. An experienced typologist — Greenberg was a pioneer in the field — can quickly recognize or reject several potential cognates in this table as probable or improbable. For example, the path p > f is extremely frequent, the path f > p much less so, enabling one to hypothesize that fi : pi and fik : pix are indeed related and go back to protoforms *pi and *pik/x, while knowledge that k > x is extremely frequent, x > k much less so enables one to choose *pik over *pix. Thus, while mass comparison does not attempt to produce reconstructions of protolanguages — according to Greenberg (2005:318) these belong to a later phase of study — phonological considerations come into play from the very beginning.
The tables used in actual research involve much larger numbers of items and languages. The items included may be either lexical, such as 'hand', 'sky', and 'go', or morphological, such as PLURAL and MASCULINE (Ruhlen 1987, p. 120).
Detection of borrowings
Critics of mass comparison generally assume that mass comparison has no means to distinguish borrowed forms from inherited ones, unlike comparative reconstruction, which is able to do so through regular sound correspondences. These questions were addressed by Greenberg (1957, p. 39) as of the 1950s. According to him, the key points are as follows :
- Basic vocabulary is much less readily borrowed than cultural vocabulary.
- "[D]erivational, inflectional, and pronominal morphemes and morph alternations are the least subject of all to borrowing."
- Any type of linguistic item may be borrowed "on occasion". However, "fundamental vocabulary is proof against mass borrowing."
- Mass comparison does not possess means to distinguish borrowing in every instance: "in particular and infrequent instances the question of borrowing may be doubtful". However, it is always possible to detect whether borrowing is responsible for "a mass of resemblances" between languages: "Where a mass of resemblances is due to borrowing, they will tend to appear in cultural vocabulary and to cluster in certain semantic areas which reflect the cultural nature of the contact."
- The technique of mass comparison, as opposed to bilateral comparison, provides a check on whether forms are borrowed or not (Greenberg 1957, p. 40):
- Borrowing can never be an over-all explanation of a mass of recurrent basic resemblances in many languages occurring over a wide geographical area.... Since we find independent sets of resemblances between every pair of languages, among every group of three languages, and so on, each language would have to borrow from every other.
- "[R]ecurrent sound correspondences" do not suffice to detect borrowing, since "where loans are numerous, they often show such correspondences" (Greenberg 1957, pp. 39–40).
Greenberg considered that the results achieved through this method approached certainty (Greenberg 1957, p. 39): "The presence of fundamental vocabulary resemblances and resemblances in items with grammatical function, particularly if recurrent through a number of languages, is a sure indication of genetic relationship."
The place of sound correspondences in the comparative method
It is often reported that Greenberg sought to replace the comparative method with a new method, mass comparison (or, among his less scrupulous critics, "mass lexical comparison"). He consistently rejected this characterization, stating for instance, "The methods outlined here do not conflict in any fashion with the traditional comparative method" (1957:44) and expressing wonderment at "the strange and widely disseminated notion that I seek to replace the comparative method with a new and strange invention of my own" (2002:2). According to Greenberg, mass comparison is the necessary "first step" in the comparative method (1957:44), and "once we have a well-established stock I go about comparing and reconstructing just like anyone else, as can be seen in my various contributions to historical linguistics" (1990, quoted in Ruhlen 1994:285). Reflecting the methodological empiricism also present in his typological work, he viewed facts as of greater weight than their interpretations, stating (1957:45):
- [R]econstruction of an original sound system has the status of an explanatory theory to account for etymologies already strong on other grounds. Between the *vaida of Bopp and the *γwoidxe of Sturtevant lie more than a hundred years of the intensive development of Indo-European phonological reconstruction. What has remained constant has been the validity of the etymologic relationship among Sanskrit veda, Greek woida, Gothic wita, all meaning "I know", and many other unshakable etymologies both of root and of non-root morphemes recognized at the outset. And who will be bold enough to conjecture from what original the Indo-Europeanist one hundred years from now will derive these same forms?
The thesis of mass comparison, then, is that:
- A group of languages is related when they show numerous resemblances in basic vocabulary, including pronouns, and morphemes, forming an interlocking pattern common to the group.
- While mass comparison cannot identify every instance of borrowing, it can identify broad patterns of borrowing, which suffices in establishing genetic relationship.
- The results achieved approach certainty.
- It is unnecessary to establish sets of recurrent sound correspondences or reconstructed ancestral forms to identify genetic relationships. On the contrary, it is not possible to establish such correspondences or to reconstruct such forms until genetic relationships are identified.
The myth of ‘mass lexical comparison’
It is widely believed among linguists that Greenberg's method of language classification was limited to comparisons of words alone, to the neglect of grammatical elements, which could often provide more decisive evidence for language relationship or non-relationship. Greenberg's method, many of them state, is known as "mass lexical comparison" (e.g. Kessler 2001, p. ix).
In reality, Greenberg never used the phrase "mass lexical comparison". It is not found in any of his principal works on language classification or anywhere else in his works. It does not occur, for instance, in Greenberg 1955, 1957, 1960, 1971, 1987, 2000–2002, or 2005. Furthermore, the phrase "mass lexical comparison" is not used by any of Greenberg's supporters, for example John Bengtson, Harold C. Fleming, Paul Newman, Merritt Ruhlen, Timothy Usher, or William S.-Y. Wang.
Probably the most influential critique of mass comparison is that by Lyle Campbell. According to Campbell, Greenberg's method of language classification "relies on inspectional similarities in vocabulary alone" (Campbell 2004, p. 348):
- The best-known of the approaches which rely on inspectional resemblances among lexical items is that advocated by Joseph Greenberg, called 'multilateral (or mass) comparison'. It is based on 'looking at ... many languages across a few words' rather than at 'a few languages across many words' (Greenberg 1987, p. 23). The lexical similarities determined by superficial visual inspection which are shared 'across many languages' alone are taken as evidence of genetic relationship. This approach stops where others begin, at the assembling of lexical similarities. These inspectional resemblances must be investigated to determine why they are similar, whether the similarity is due to inheritance from a common ancestor (the result of a distant genetic relationship) or to borrowing, accident, onomatopoeia, sound symbolism, nursery formations and the various things which we will consider in this chapter. Since multilateral comparison does not do this, its results are controversial and rejected by most mainstream historical linguists.
- In short, no technique which relies on inspectional similarities in vocabulary alone has proven adequate for establishing distant family relationships.
Greenberg consistently rejected the assertion that he relied on lexical comparisons alone. He went so far as to publish the first volume of his Eurasiatic work, devoted to grammatical comparisons, two years before the second volume, devoted to vocabulary comparisons, in an attempt to get the point across (2000: vii):
- This grammatical evidence is quite sufficient in itself to establish the validity of the Eurasiatic language family. I have chosen to present it first for several reasons. One of these ... is that, despite all the facts regarding the presentation of evidence for linguistic stocks in my previous work, the myth persists that I only take into account vocabulary evidence.
Typical of Greenberg's use of morphological comparisons is this (1955: 82, 83):
- In phonology, the most important evidence of the basically Khoisan relationships of Hottentot is the frequency of the click sounds and the essential part they play in the economy of the language. As in other Khoisan languages, they only occur initially.
- Hottentot shares with the Bushman languages the following distinctive method of root formation in which the clicks play a fundamental part. Verb, noun and adjective roots are mostly disyllabic, or can be reconstructed as once having been disyllabic. The roots begin most frequently with a click, sometimes with a non-click consonant. This is followed by a restricted group of vowels in the second position, basically o or a. The third position is either vacant or one of a small number of non-click consonants occur: r, m, n or a labial (in Nama Hottentot phonemically a p). In the fourth or final position we find the full set of vowels - a, e, i, o, or u.
Throughout his work on African classifications, Greenberg's method is the same: he begins with a discussion of morphology, and then follows this up with a few pages of lexical comparisons.
Comparisons of the number of pages devoted to grammatical versus lexical comparisons from the beginning, middle, and end of Greenberg's career show the same pattern: In Greenberg 1955 (Africa), there are 38 pages of grammatical comparisons, versus 25 of lexical comparisons. In Greenberg 1971 (Indo-Pacific), there are 21 pages of grammatical comparisons versus 34 of lexical comparisons. In Greenberg 2000-2002 (Eurasiatic), there are 179 pages of grammatical comparisons versus 181 of lexical comparisons.
Greenberg did not come by this position late in his career. As early as 1956, he stated (2005: 60):
- Only those resemblances which involve both sound and meaning simultaneously are considered relevant for historical connections. When the morphemes involved are roots this is called lexical comparison, when they are affixes, grammatical. There is no contradiction in the results attained by lexical and grammatical comparison and both methods are employed as far as possible.
In sum, mainstream historical linguists believe that Joseph Greenberg advocated and practiced a technique limited to lexical comparison. Greenberg's published writings show that he advocated the use of both lexical and grammatical data and that he carried out this theoretical desideratum in practice. No such technique as "mass lexical comparison" has ever existed.
The disputed legacy of the comparative method
The conflict over mass comparison can be seen as a dispute over the legacy of the comparative method, developed in the 19th century, primarily by Danish and German linguists, in the study of Indo-European languages.
Position of Greenberg’s detractors
Since the development of comparative linguistics in the 19th century, a linguist who claims that two languages are related, whether or not there exists historical evidence, is expected to back up that claim by presenting general rules that describe the differences between their lexicons, morphologies, and grammars. The procedure is described in detail in the comparative method article.
For instance, one could prove that Spanish is related to Italian by showing that many words of the former can be mapped to corresponding words of the latter by a relatively small set of replacement rules—such as the correspondence of initial es- and -s, final -os and -i, etc. Many similar correspondences exist between the grammars of the two languages. Since those systematic correspondences are extremely unlikely to be random coincidences, the most likely explanation by far is that the two languages have evolved from a single ancestral tongue (Latin, in this case).
Response of Greenberg’s defenders
The actual development of the comparative method was a more gradual process than Greenberg's detractors suppose. It has three decisive moments. The first was Rasmus Rask's observation in 1818 of a possible regular sound change in Germanic consonants. The second was Jacob Grimm's extension of this observation into a general principle (Grimm's law) in 1822. The third was Karl Verner's resolution of an irregularity in this sound change (Verner's law) in 1875. Only in 1861 did August Schleicher, for the first time, present systematic reconstructions of Indo-European proto-forms (Lehmann 1993:26). Schleicher, however, viewed these reconstructions as extremely tentative (1874:8). He never claimed that they proved the existence of the Indo-European family, which he accepted as a given from previous research — primarily that of Franz Bopp, his great predecessor in Indo-European studies.
Karl Brugmann, who succeeded Schleicher as the leading authority on Indo-European, and the other Neogrammarians of the late 19th century, distilled the work of these scholars into the famous (if often disputed) principle that "every sound change, insofar as it occurs automatically, takes place according to laws that admit of no exception" (Brugmann 1878).
The Neogrammarians did not, however, regard regular sound correspondences or comparative reconstructions as relevant to the proof of genetic relationship between languages. In fact, they made almost no statements on how languages are to be classified (Greenberg 2005:158). The only Neogrammarian to deal with this question was Berthold Delbrück, Brugmann’s collaborator on the Grundriß der vergleichenden Grammatik der indogermanischen Sprachen (Greenberg 2005:158-159, 288). According to Delbrück (1904:121-122, quoted in Greenberg 2005:159), Bopp had proved the existence of Indo-European in the following way:
- The proof was produced by juxtaposing words and forms of similar meanings. When one considers that in these languages the formation of the inflectional forms of the verb, noun and pronoun agrees in essentials and likewise that an extraordinary number of inflected words agree in their lexical parts, the assumption of chance agreement must appear absurd.
Furthermore, Delbrück took the position later enunciated by Greenberg on the priority of etymologies to sound laws (1884:47, quoted in Greenberg 2005:288): "obvious etymologies are the material from which sound laws are drawn."
The opinion that sound correspondences or, in another version of the opinion, reconstruction of a proto-language are necessary to show relationship between languages thus dates from the 20th, not the 19th century, and was never a position of the Neogrammarians. Indo-European was recognized by scholars such as William Jones (1786) and Franz Bopp (1816) long before the development of the comparative method.
Furthermore, Indo-European was not the first language family to be recognized by students of language. Semitic had been recognized by European scholars in the 17th century, Finno-Ugric in the 18th. Dravidian was recognized in the mid-19th century by Robert Caldwell (1856), well before the publication of Schleicher's comparative reconstructions.
Finally, the supposition that all of the language families generally accepted by linguists today have been proved by the comparative method is untrue. For example, although Eskimo–Aleut has long been accepted as a valid family, "Proto-Eskimo–Aleut has not yet been reconstructed" (Bomhard 2008:209). Other families were accepted for decades before comparative reconstructions of them were put forward, for example Afro-Asiatic and Sino-Tibetan. Many languages are generally accepted as belonging to a language family even though no comparative reconstruction exists, often because the languages are only attested in fragmentary form, such as the Anatolian language Lydian (Greenberg 2005:161). Conversely, detailed comparative reconstructions exist for some language families which nonetheless remain controversial, such as Altaic and Nostratic (however, a specification is needed here: Nostratic is a proposed proto-proto-language, while Altaic is a "simple" proto-language - with Altaic languages widely accepted as typologically related. Detractors of both proposals simply claim that the data collected to prove by comparativism the existence of both families is scarce, wrong and non sufficient. Keep in mind that regular phonological correspondences need thousands of lexicon lists to be prepared and compared before being established. These lists are lacking for both the proposed families. Furthermore, other specific problems affect "comparative" lists of both proposals, like the late attestation for Altaic languages, or the comparison of not certain proto-forms, like proto-Kartvelian, for Nostratic.).
A continuation of earlier methods?
Greenberg claimed that he was at bottom merely continuing the simple but effective method of language classification that had resulted in the discovery of numerous language families prior to the elaboration of the comparative method (1955:1-2, 2005:75) and that had continued to do so thereafter, as in the classification of Hittite as Indo-European in 1917 (Greenberg 2005:160-161). This method consists in essentially two things: resemblances in basic vocabulary and resemblances in inflectional morphemes. If mass comparison differs from it in any obvious way, it would seem to be in the theoretization of an approach that had previously been applied in a relatively ad hoc manner and in the following additions:
- The explicit preference for basic vocabulary over cultural vocabulary.
- The explicit emphasis on comparison of multiple languages rather than bilateral comparisons.
- The very large number of languages simultaneously compared (up to several hundred).
- The introduction of typologically based paths of sound change.
The positions of Greenberg and his critics therefore appear to provide a starkly contrasted alternative:
- According to Greenberg, the identification of sound correspondences and the reconstruction of protolanguages arise from genetic classification.
- According to Greenberg’s critics, genetic classification arises from the identification of sound correspondences or (others state) the reconstruction of protolanguages.
Time limits of the comparative method
Besides systematic changes, languages are also subject to random mutations (such as borrowings from other languages, irregular inflections, compounding, and abbreviation) that affect one word at a time, or small subsets of words. For example, Spanish perro (dog), which does not come from Latin, cannot be rule-mapped to its Italian equivalent cane (the Spanish word can would be the Latin-derived equivalent but is much less used in everyday conversations, being reserved for more formal purposes). As those sporadic changes accumulate, they will increasingly obscure the systematic ones — just as enough dirt and scratches on a photograph will eventually make the face unrecognizable.
On this point, Greenberg and his critics agree, as over against the Moscow school, but they draw contrasting conclusions:
- Greenberg’s critics argue that the comparative method has an inherent limit of 6,000 – 10,000 years (depending on the author), and that beyond this too many irregularities of sound change have accumulated for the method to function. Since according to them the identification of regular sound correspondences is necessary to establish genetic relationship, they conclude that genetic relationships older than 10,000 years (or less) cannot be determined. In consequence, it is not possible to go much beyond those genetic classifications that have already been arrived at (e.g. Ringe 1992:1).
- Greenberg argued that cognates often remain recognizable even when recurrent sound changes have been overlaid by idiosyncratic ones or interrupted by analogy, citing the cases of English brother (2002:4), which is easily recognizable as a cognate of German Bruder even though it violates Verner’s law, and Latin quattuor (1957:45), easily recognizable as a reflex of Proto-Indo-European *kʷetwor even though the changes e > a and t > tt violate the usual sound changes from Proto-Indo-European to Latin. (In the case of brother, the sound changes are actually known, but intricate, and are only decipherable because the language is heavily documented from an early date. In the case of quattuor, the changes are genuinely irregular, and the form of the word can only be explained through means other than regular sound change, such as the operation of analogy.)
- In contrast, the "Moscow school" of linguists, perhaps best known for its advocacy of the Nostratic hypothesis (though active in many other areas), has confidence in the traceability of regular sound changes at very great time depths, and believes that reconstructed proto-languages can be pyramided on top of each other so as to attain still earlier proto-languages, without violating the principles of the standard comparative method.
The mathematics of language comparison
An unexpected offshoot of the controversy over mass comparison has been a new debate over the mathematics of language classification.
Greenberg’s initial position
From an early date, Greenberg (esp. 1957:36-44) argued that mass comparison rests on a mathematical basis. Although "[t]he most straightforward method of eliminating chance would be the calculation of the expected number of chance resemblances between two languages", "[i]n practice, this proves extremely difficult" (1957:37). For one thing, "it requires ... a frequency weighting of phonemes", along with an evaluation of "the possibilities of phonemic combination" (ib.). Complicating the issue, it is often the case that languages with very different levels of relationship show "approximately the same" number of resemblances (ib.). The solution, according to Greenberg, is to consider multiple languages at once (ib.): the key lies in their overlapping relationships, not in their two-by-two resemblances. According to him (1957:38-39):
- The following fundamental probability considerations apply. The likelihood of finding a resemblance in sound and meaning in three languages is the square of its probability in two languages. In general, the probability for a single language must be raised to the (n – th) power for n languages. Thus if five languages each showed a total of 8 per cent sound-meaning resemblance to one another, on a chance basis one would expect (0.08) or 0.00004096 resemblances in all five languages. This is approximately 1/25,000.
Ringe’s attack on Greenberg
In a series of articles, Donald Ringe (1992, 1993, 1995, 1996) has attacked Amerind, Nostratic, and other proposals of "long-range" language classification on mathematical grounds. In his view "the remoter relationships cannot be demonstrated because the languages in question have diverged too much" (ib.). According to Ringe, sound change renders linguistic relationships untraceable over time. The level of chance resemblances between languages, however, is relatively high. Not having considered the possibility of chance resemblances, the relationships Greenberg alleges are indistinguishable from coincidence.
Greenberg replied that he had considered this very possibility in his previous work, which Ringe had failed to cite and thus, presumably, to read (Greenberg 1993, p. 79). This began an ongoing series of exchanges between scholars inclined to support mass comparison and those inclined to oppose it.
State of the question
Today there are three distinct views on the mathematics of language classification with respect to mass comparison.
- One view, represented by Donald Ringe, holds that language classification can be mathematized and the results show that mass comparison is invalid, finding only resemblances that do not rise above the level of chance.
- Another view, represented by William Baxter and Alexis Manaster Ramer (1999) and by Greenberg himself, holds that language classification can be mathematized and the results show that mass comparison is valid, finding resemblances that go far beyond what can be expected by chance.
- A third view, represented by Johanna Laakso, holds that language classification cannot be reduced to mathematics. Laakso is unwilling to give up correspondences that appear to be "intuitive" but in fact represent logical perceptions that most people are unwilling to theorize because of their subtlety and fineness, yet which are quite real and indispensable. As she states in a review of Angela Marcantonio's The Uralic Language Family:
- [T]he traditional model of linguistic relatedness cannot be completely and exactly algorithmised; rather, it is a pattern explanation consisting of many interlinked parts, complex and yet tolerating gaps in its construction. In many details it seems to be based on intuition and fingertip feeling, but, actually, it is dependent of various external and internal background factors.
Toward a resolution of the conflict?
In spite of the apparently intractable nature of the conflict between Greenberg and his critics, a few linguists have begun to argue for its resolution. Edward Vajda, acclaimed for his recent demonstration of Dené–Yeniseian, attempts to stake out a position that is sympathetic to both Greenberg’s approach and that of its critics, such as Lyle Campbell and Johanna Nichols. George Starostin, a member of the Moscow school, argues that Greenberg’s work, while perhaps not going beyond inspection, presents interesting sets of forms that call for further scrutiny by comparative reconstruction, specifically with regard to the proposed Khoisan  and Amerind  families.
- Baxter, William H. and Alexis Manaster Ramer. 1999. "Beyond lumping and splitting: Probabilistic issues in historical linguistics."
- Bomhard, Allan R. 2008. Reconstructing Proto-Nostratic: Comparative Phonology, Morphology, and Vocabulary, 2 volumes. Leiden: Brill.
- Bopp, Franz. 1816. Über das Conjugationssystem der Sanskritsprache in Vergleichung mit jenem der griechischen, lateinischen, persischen und germanischen Sprache. Frankfurt-am-Main: Andreäischen Buchhandlung.
- Brugmann, Karl. 1878. Preface to the first issue of Morphologische Untersuchungen auf dem Gebiete der indogermanischen Sprachen. Leipzig: S. Hirzel. (The preface is signed Hermann Osthoff and Karl Brugmann but was written by Brugmann alone.)
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- Caldwell, Robert. 1856. A Comparative Grammar of the Dravidian or South-Indian Family of Languages. London: Harrison.
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- Georg, Stefan; Vovin, Alexander (2003). "From Mass Comparison to Mess Comparison: Greenberg's "Eurasiatic" Theory". Diachronica (20:2): pp. 331–362.
- Greenberg, Joseph H. (1955). Studies in African Linguistic Classification. New Haven: Compass Publishing Company. (Photo-offset reprint of eight articles published in the Southwestern Journal of Anthropology from 1949 to 1954, with minor corrections.)
- Greenberg, Joseph H. 1960. "The general classification of Central and South American languages." In Selected Papers of the Fifth International Congress of Anthropological and Ethnological Sciences, 1956, edited by Anthony F.C. Wallace, 791-94. Philadelphia|publisher=University of Pennsylvania Press. (Reprinted in Greenberg 2005, 59-64.)
- Greenberg, Joseph H. (1963). The Languages of Africa. Bloomington: Indiana University Press. (Heavily revised version of Greenberg 1955.)(From the same publisher: second, revised edition, 1966; third edition, 1970. All three editions simultaneously published at The Hague by Mouton & Co.)
- Greenberg, Joseph H. 1971. "The Indo-Pacific hypothesis." Current Trends in Linguistics, Volume 8: Linguistics in Oceania, edited by Thomas F. Sebeok, 807-871. The Hague: Mouton. (Reprinted in Greenberg 2005.)
- Greenberg, Joseph (1993). "Observations concerning Ringe's 'Calculating the factor of chance in language comparison". Proceedings. 137.1. American Philosophical Society. pp. 79–90. http://www.jstor.org/pss/986946.
- Greenberg, Joseph H. (2000). Indo-European and Its Closest Relatives. Stanford: Stanford University Press.
- Greenberg, Joseph H. (2002). Indo-European and Its Closest Relatives: The Eurasiatic Language Family, Volume 2: Lexicon. Stanford: Stanford University Press.
- Greenberg, Joseph H. (2005). Genetic Linguistics: Essays on Theory and Method, edited by William Croft. Oxford. Oxford University Press.
- Kessler, Brett (2001). The Significance of Word Lists: Statistical Tests for Investigating Historical Connections Between Languages. Stanford, California: CSLI Publications.
- Laakso, Johanna. 2003. "Linguistic shadow-boxing." Review of The Uralic Language Family: Facts, Myths and Statistics by Angela Marcantonio.
- Lehmann, Winfred P. 1993. Theoretical Bases of Indo-European Linguistics. London: Routledge
- Ringe, Donald. 1992. "On calculating the factor of chance in language comparison." American Philosophical Society, Transactions 82.1, 1-110.
- Ringe, Donald. 1993. "A reply to Professor Greenberg." American Philosophical Society, Proceedings 137, 91-109.
- Ringe, Donald A., Jr. 1995. "'Nostratic' and the factor of chance." Diachronica 12.1, 55-74.
- Ringe, Donald A., Jr. 1996. "The mathematics of 'Amerind'." Diachronica 13, 135-54.
- Ruhlen, Merritt. 1994. On the Origin of Languages: Studies in Linguistic Taxonomy. Stanford: Stanford University Press.
- Schleicher, August. 1861-1862. Compendium der vergleichenden Grammatik der indogermanischen Sprachen. Kurzer Abriss der indogermanischen Ursprache, des Altindischen, Altiranischen, Altgriechischen, Altitalischen, Altkeltischen, Altslawischen, Litauischen und Altdeutschen, 2 volumes. Weimar: H. Boehlau.
- Schleicher, August. 1874. A Compendium of the Comparative Grammar of the Indo-European, Sanskrit, Greek, and Latin Languages, translated from the third German edition by Herbert Bendall. London: Trübner and Co. (An abridgement of the German original.)
- Clifton, John. 2002. LINGUIST List 13.491: Review of Kessler 2001.
- Hock, Hans Henrich and Brian D. Joseph. 1996. Language History, Language Change, and Language Relationship: An Introduction to Historical and Comparative Linguistics. Berlin: Mouton de Gruyter.
- Kessler, Brett. 2003. Review of Time Depth in Historical Linguistics. Diachronica 20, 373-377.
- Kessler, Brett and A. Lehtonen. 2006. "Multilateral comparison and significance testing of the Indo-Uralic question." In Phylogenetic Methods and the Prehistory of Languages, edited by Peter Foster and Colin Renfrew. McDonald Institute for Archaeological Research. (Also: Unofficial prepublication draft (2004).)
- Matisoff, James. 1990. "On megalocomparison." Language 66, 109-20.
- Poser, William J. and Lyle Campbell. 1992. "Indo-european practice and historical methodology." Proceedings of the Eighteenth Annual Meeting of the Berkeley Linguistics Society, 214-236.
- Greenberg, Joseph H. 1990. "The American Indian language controversy." Review of Archaeology 11, 5-14.
- Newman, Paul. 1995. On Being Right: Greenberg’s African Linguistic Classification and the Methodological Principles Which Underlie It. Bloomington: Institute for the Study of Nigerian Languages and Cultures, African Studies Program, Indiana University.
- Ruhlen, Merritt. 1994. The Origin of Language: Tracing the Evolution of the Mother Tongue. New York: John Wiley and Sons.
- "How likely are chance resemblances between languages?" by Mark Rosenfelder (2002)
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Comparison of Windows and Linux — Comparison of the Microsoft Windows and Linux operating system is a common topic of discussion among their users. Windows is the most prominent proprietary operating system, while Linux is the most prominent operating system that is free software … Wikipedia
Mass killings under Communist regimes — Part of the series on Communism … Wikipedia
Comparison of the AK-47 and M16 — M16 (top) and AK 47 (bottom) assault rifles Firearm AK 47 M16A1 Manufacturer Izhmash ArmaLite, Colt … Wikipedia
Comparison of audio player software — This article is about audio player software. For a comparison of video player software (including software capable of playing both audio and video), see Comparison of video player software. For a comparison of hardware device type portable media… … Wikipedia