`scipy.stats._continuous_distns:chi_gen`

source: /scipy/stats/_continuous_distns.py :1524

Signature

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

Members

Summary

A chi continuous random variable.

Extended Summary

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Notes

The probability density function for chi is:

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

for $x >= 0$ and $k > 0$ (degrees of freedom, denoted df in the implementation). $Γ$ is the gamma function (scipy.special.gamma).

Special cases of chi are:

chi(1, loc, scale) is equivalent to halfnorm
chi(2, 0, scale) is equivalent to rayleigh
chi(3, 0, scale) is equivalent to maxwell

chi takes df as a shape parameter.

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Aliases

scipy.stats._continuous_distns.chi_gen