chi-square distribution

(redirected from Chi2 distribution)
Also found in: Dictionary, Encyclopedia.
Related to Chi2 distribution: Gamma distribution, T distribution, chi2 test

chi-square dis·tri·bu·tion

a variable is said to have a chi-square distribution with K degrees of freedom if it is distributed like the sum of the squares of K independent random variables, each of which has a normal (gaussian) distribution with mean zero and variance one. The chi-square distribution is the basis for many variations of the chi-square(d) test, perhaps the most widely used test for statistical significance in biology and medicine.
Farlex Partner Medical Dictionary © Farlex 2012