scipy.special.fdtr

scipy.special.fdtr(x1, x2, x3[, out]) = <ufunc 'fdtr'>

fdtr(dfn, dfd, x)

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.