StatsNCFCDF
StatsNCFCDF (x, n1, n2, d)
The StatsNCFCDF function returns the cumulative distribution function of the noncentral F distribution. n1 and n2 are the shape parameters and d is the noncentrality measure. There is no closed form expression for the distribution.
References
Evans, M., N. Hastings, and B. Peacock, Statistical Distributions, 3rd ed., Wiley, New York, 2000.