F distribution
noun Etymology: Sir Ronald Fisher died 1962 English geneticist and statistician Date: 1947 a probability density function that is used especially in analysis of variance and is a function of the ratio of two independent random variables each of which has a chi-square distribution and is divided by its number of degrees of freedom

New Collegiate Dictionary. 2001.

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  • F-distribution — Probability distribution name =Fisher Snedecor type =density pdf cdf parameters =d 1>0, d 2>0 deg. of freedom support =x in [0, +infty)! pdf =frac{sqrt{frac{(d 1,x)^{d 1},,d 2^{d 2{(d 1,x+d 2)^{d 1+d 2{x,mathrm{B}!left(frac{d 1}{2},frac{d 2}{2}… …   Wikipedia

  • F distribution — noun A probability distribution of the ratio of two variables, each with a chi square distribution; used in analysis of variance, especially in the significance testing of a correlation coefficient (R squared) …   Wiktionary

  • F-distribution — the ratio of two independent chi square distributions; the exact sampling distribution of the ratio of variances from two independent samples from identical normal distributions …   Medical dictionary

  • Noncentral F-distribution — In probability theory and statistics, the noncentral F distribution is a continuous probability distribution that is a generalization of the (ordinary) F distribution. It describes the distribution of the quotient (X/n1)/(Y/n2), where the… …   Wikipedia

  • F (disambiguation) — F is the sixth letter of the Latin alphabet. F may also refer to:cience*Fahrenheit *Farad, a unit for electric capacitance *Faraday constant *Fluorine *Focal length **f number, the focal length divided by the aperture diameter *Force *FrequencyAs …   Wikipedia

  • Distribution — Dis tri*bu tion, n. [L. distributio: cf. F. distribution.] 1. The act of distributing or dispensing; the act of dividing or apportioning among several or many; apportionment; as, the distribution of an estate among heirs or children. [1913… …   The Collaborative International Dictionary of English

  • F-ratio (disambiguation) — F ratio or f ratio may refer to:* f number, f ratio, or focal ratio, the ratio of the focal length of an optical system to the diameter of its entrance pupil; * f ratio, in oceanography, which relates recycled and total primary production in the… …   Wikipedia

  • F-test — An F test is any statistical test in which the test statistic has an F distribution if the null hypothesis is true. The name was coined by George W. Snedecor, in honour of Sir Ronald A. Fisher. Fisher initially developed the statistic as the… …   Wikipedia

  • distribution logarithmonormale — logaritminis normalusis skirstinys statusas T sritis fizika atitikmenys: angl. logarithmic normal distribution; lognormal distribution vok. logarithmische Normalverteilung, f; lognormale Verteilung, f; Lognormalverteilung, f rus. логарифмически… …   Fizikos terminų žodynas

  • distribution lognormale — logaritminis normalusis skirstinys statusas T sritis fizika atitikmenys: angl. logarithmic normal distribution; lognormal distribution vok. logarithmische Normalverteilung, f; lognormale Verteilung, f; Lognormalverteilung, f rus. логарифмически… …   Fizikos terminų žodynas

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