# scipy.special.fdtr¶

scipy.special.fdtr(dfn, dfd, x) = <ufunc 'fdtr'>

F cumulative distribution function

Returns the area from zero to x under the F density function (also known as Snedcor’s density or the variance ratio density). This is the density of X = (unum/dfn)/(uden/dfd), where unum and uden are random variables having Chi square distributions with dfn and dfd degrees of freedom, respectively.

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