d Materials by Patrick Royston, Imperial College, London.

d Patrick Royston <p.royston@@ic.ac.uk> is a biostatistician at the Imperial
d College School of Medicine, London, and a frequent contributor to the Stata
d Technical Bulletin.  His areas of interest include regression modelling (e.g.
d fractional polynomials), survival analysis, probabililty distributions,
d and age-specific reference intervals.

p mfracpol Multivariable fractional polynomials (Stata 6 version)