scipy.special.fdtridfd

scipy.special.fdtridfd(dfn, p, x, out=None) = <ufunc 'fdtridfd'>

Inverse to fdtr vs dfd

Finds the F density argument dfd such that fdtr(dfn, dfd, x) == p.

Parameters:

dfnarray_like

First parameter (positive float).

parray_like

Cumulative probability, in [0, 1].

xarray_like

Argument (nonnegative float).

outndarray, optional

Optional output array for the function values

Returns:

dfdscalar or ndarray

dfd such that fdtr(dfn, dfd, x) == p.

See also

fdtr

F distribution cumulative distribution function

fdtrc

F distribution survival function

fdtri

F distribution quantile function

scipy.stats.f

F distribution

Examples

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Compute the F distribution cumulative distribution function for one parameter set.

>>> from scipy.special import fdtridfd, fdtr
>>> dfn, dfd, x = 10, 5, 2
>>> cdf_value = fdtr(dfn, dfd, x)
>>> cdf_value
0.7700248806501017

Verify that fdtridfd recovers the original value for dfd:

>>> fdtridfd(dfn, cdf_value, x)
5.0

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