- Bias (statistics)
In

statistics , the term**bias**is used for describing several different concepts:

* Abiased sample is one in which some members of the population are more likely to be included than others.

**Spectrum bias refers to evaluating the ability of a diagnostic test in a biased group of patients which leads to an overestimation of the sensitivity and specificity of the test.

* Thebias of an estimator is the difference between an estimator's expectation and the true value of the parameter being estimated.

**Omitted-variable bias is the bias that appears in estimates of parameters in a regression analysis when the assumed specification is incorrect, in that it omits an independent variable that should be in the model.

* Instatistical hypothesis testing , a test is said to be**unbiased**when the probability of rejecting the null hypothesis exceeds the significance level when the alternative is true "and" is less than or equal to the significance level when the null hypothesis is true.

*Systematic bias orsystemic bias are external influences that may affect the accuracy of statistical measurements.

*Data-snooping bias comes from the misuse of data mining techniques.

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**Bias (disambiguation)**— Bias is an inclination towards something, or a predisposition, partiality, prejudice, preference, or predilection. Bias may also refer to:In science and statistics: * Bias (statistics), the systematic distortion of a statistic ** A biased sample… … Wikipedia**Bias**— This article is about different ways the term bias is used . For other uses, see Bias (disambiguation). Bias is an inclination to present or hold a partial perspective at the expense of (possibly equally valid) alternatives. Bias can come in many … Wikipedia**Statistics New Zealand**— Tatauranga Aotearoa Statistics New Zealand logo Agency overview Jurisdiction New Zealand Headquarters … Wikipedia**bias**— [bī′əs] n. pl. biases [MFr biais, a slope, slant < OFr < OProv < ?] 1. a line, cut or sewn diagonally across the weave of cloth, as in making seams, binding tape, etc. 2. a mental leaning or inclination; partiality; bent 3. Lawn Bowling… … English World dictionary**Bias of an estimator**— In statistics, the difference between an estimator s expected value and the true value of the parameter being estimated is called the bias. An estimator or decision rule having nonzero bias is said to be biased.Although the term bias sounds… … Wikipedia**bias**— /buy euhs/, n., adj., adv., v., biased, biasing or (esp. Brit.) biassed, biassing. n. 1. an oblique or diagonal line of direction, esp. across a woven fabric. 2. a particular tendency or inclination, esp. one that prevents unprejudiced… … Universalium**bias**— n. & v. n. 1 (often foll. by towards, against) a predisposition or prejudice. 2 Statistics a systematic distortion of a statistical result due to a factor not allowed for in its derivation. 3 an edge cut obliquely across the weave of a fabric. 4… … Useful english dictionary**bias**— A line diagonal to the grain of a fabric at a 45° angle (half way between vertical and horizontal) to the selvage often utilized in the cutting, folding, or arranging of fabric. In another sense, bias can be a preference or inclination of… … Glossary of Art Terms**List of statistics topics**— Please add any Wikipedia articles related to statistics that are not already on this list.The Related changes link in the margin of this page (below search) leads to a list of the most recent changes to the articles listed below. To see the most… … Wikipedia**Non-response bias**— occurs in statistical surveys if the answers of respondents differ from the potential answers of those who did not answer. Contents 1 Example 2 Test 3 Related terminology 4 See also … Wikipedia