f(x) = {1/[2^{/2} * (/2)]} * [x^{(/2)-1} * e^{-x/2}]

= 1, 2, ..., 0 < x

where

is the degrees of freedom

e is the
base of the natural logarithm, sometimes called Euler's e (2.71...)

(gamma) is the Gamma function

The above animation shows the shape of the *Chi-square* distribution as the degrees of freedom increase (1, 2, 5, 10, 25 and 50).

statická ukážka