SUBJECT: Nonlinear regression models involving power or exponential functions of covariates AUTHORS: Patrick Royston Imperial College School of Medicine, UK Gareth Ambler Imperial College School of Medicine, UK SUPPORT: proyston@rpms.ac.uk gambler@rpms.ac.uk INSTALLATION: Use standard in1 installation instructions. HELP: From inside Stata, on-line help is available. Type . help boxtid . help fracpoly . help fracpred