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st: New version of -bspline- on SSC

From   "Roger B. Newson" <>
To   "" <>
Subject   st: New version of -bspline- on SSC
Date   Tue, 31 Dec 2013 16:19:45 +0000

Thanks as always to Kit Baum, a new vrsion of the -bspline- package is now available for download from SSC. In Stata, use the -ssc- command to do this, or -adoupdate- if you already have an old version of -bspline-.

The -bspline- package is described as below on my website The new version fixes a bug in the -flexcurv- module, which caused -flexcurv- to compute values for reference splines in observations not included by the -if- and -in- qualifier. It also adds hypertext to the on-line help, allowing access to my STB and Stata Journal articles and Stata User Meeting presentations on the -bspline- package.

Best wishes


Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology, Occupational Medicine
and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Web page:
Departmental Web page:

Opinions expressed are those of the author, not of the institution.

package bspline from

      bspline: Create a basis of B-splines or reference splines

      The bspline package contains 3 commands, bspline, frencurv
      and flexcurv.  bspline generates a basis of B-splines in the
      X-variate based on a list of knots, for use in the design
      matrix of a regression model.  frencurv generates a basis of
      reference splines, for use in the design matrix of a
      regression model, with the property that the parameters
      fitted will be values of the spline at a list of reference
      points.  flexcurv is an easy-to-use version of frencurv, and
      generates reference splines with regularly-spaced knots, or
      with knots interpolated between the reference points.
      frencurv and flexcurv have the additional option of
      generating an incomplete basis of reference splines, which
      can be completed by the addition of the standard constant
      variable used in regression models.  The splines are either
      given the names in the newvarlist (if present), or (more
      usually) generated as a list of numbered variables, prefixed
      by the generate() option.  Usually (but not always), the
      regression command is called using the noconst option.

      Author: Roger Newson
      Distribution-date: 25 December 2013
      Stata-version: 10

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