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Posting on behalf of Patrick Royston:
Now available from SSC via -ssc install boxtid-:
TITLE
'BOXTID': module to fit Box-Tidwell and exponential regression models
DESCRIPTION/AUTHOR(S)
boxtid is a generalization of fracpoly in which continuous
rather than fractional powers of the continuous covariates are
estimated. boxtid fits Box & Tidwell's (Technometrics, 1962)
power transformation model to yvar with predictors in xvarlist.
boxtid also fits exponential models for predictors specified in
expon(). This is an updated version of Royston & Ambler,
Stata Tech. Bull. 49, 50 (1999), and contains support routines
that handle factor variables for prediction and plotting.
Requires Stata v.11+
Author: Patrick Royston, MRC Clinical Trials Unit, UK
Support: email patrick.royston@ctu.mrc.ac.uk
Kit Baum
SSC Archive
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