scipy.special.chndtr#

scipy.special.chndtr(x, df, nc, out=None) = <ufunc 'chndtr'>#

Non-central chi square cumulative distribution function

The cumulative distribution function is given by:

P(χ2|ν,λ)=j=0eλ/2(λ/2)jj!P(χ2|ν+2j),

where ν>0 is the degrees of freedom (df) and λ0 is the non-centrality parameter (nc).

Parameters:
xarray_like

Upper bound of the integral; must satisfy x >= 0

dfarray_like

Degrees of freedom; must satisfy df > 0

ncarray_like

Non-centrality parameter; must satisfy nc >= 0

outndarray, optional

Optional output array for the function results

Returns:
xscalar or ndarray

Value of the non-central chi square cumulative distribution function.