scipy.special.chdtri

scipy.special.chdtri(v, p, out=None) = <ufunc 'chdtri'>

Inverse to chdtrc with respect to x.

Returns x such that chdtrc(v, x) == p.

Parameters

varray_like

Degrees of freedom.

parray_like

Probability.

outndarray, optional

Optional output array for the function results.

Returns

xscalar or ndarray

Value so that the probability a Chi square random variable with v degrees of freedom is greater than x equals p.

See also

chdtrc, chdtr, chdtriv

References

1

Chi-Square distribution, https://www.itl.nist.gov/div898/handbook/eda/section3/eda3666.htm

Examples

>>> import scipy.special as sc

It inverts chdtrc.

>>> v, p = 1, 0.3
>>> sc.chdtrc(v, sc.chdtri(v, p))
0.3
>>> x = 1
>>> sc.chdtri(v, sc.chdtrc(v, x))
1.0