[Rd] wishlist: add functions to calculate noncentrality parameters (PR#11033)

[Jerry.Lewis at biogenidec.com]

Full_Name: Jerry W. Lewis
Version: 2.6.2
OS: Windows XP Professional
Submission from: (NULL) (198.180.131.16)


Some methods (sample size calculations, for instance) are based upon calculating
the noncentrality parameter needed to achieve a pre-specified value of the
noncentral cdf.  None of the distributions that support noncentrality parameters
have functions to return the noncentrality parameter given p.