Statistics/Chi-squared distribution: Difference between revisions
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and so, for the chi-squared cumulative probability distribution with chi-squared k, we have, substituting chi-square k into s as k/2,
: <math display="block"> F(x;\,k) = \frac{1}{\Gamma(k)} x^{(k/2)} \, \Gamma(k/2) \, e^{-x} \sum_{m=0}^\infty\frac{x^m}{\Gamma(\frac{k}{2}+m+1)}. </math>
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