`scipy.stats._continuous_distns:chi2_gen`

source: /scipy/stats/_continuous_distns.py :1608

Signature

   class     chi2_gen (    momtype    =  1   ,    a    =  None   ,    b    =  None   ,    xtol    =  1e-14   ,    badvalue    =  None   ,    name    =  None   ,    longname    =  None   ,    shapes    =  None   ,    seed    =  None     )

Members

Summary

A chi-squared continuous random variable.

Extended Summary

For the noncentral chi-square distribution, see ncx2.

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Notes

The probability density function for chi2 is:

f (x, k) = \frac{1}{2 ^{k /2} Γ ( k /2 )} x^{k /2 - 1} exp (- x /2)

for $x > 0$ and $k > 0$ (degrees of freedom, denoted df in the implementation).

chi2 takes df as a shape parameter.

The chi-squared distribution is a special case of the gamma distribution, with gamma parameters a = df/2, loc = 0 and scale = 2.

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Aliases

scipy.stats._continuous_distns.chi2_gen