chi-square (chi2) distribution(redirected from chi-square x2 distribution)
chi-square (χ2) dis·tri·bu·tion(kīskwār dis-tri-byūshŭn)
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.
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