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st: boxtid (Box-Tidwell) regression module updated

From   Christopher Baum <>
To   "" <>
Subject   st: boxtid (Box-Tidwell) regression module updated
Date   Thu, 3 Jan 2013 14:50:47 +0000

Posting on behalf of Patrick Royston:

Now available from SSC via -ssc install boxtid-:

      'BOXTID': module to fit Box-Tidwell and exponential regression models

       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

Kit Baum
SSC Archive

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