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st: New version of -bpmedian- on SSC

From   "Newson, Roger B" <>
To   "''" <>
Subject   st: New version of -bpmedian- on SSC
Date   Fri, 5 Jun 2009 16:50:34 +0100

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

The -bpmedian- package is described as below on my website. The new version fixes 2 bugs, which sometimes caused -bpmedian- to calculate the wrong median, or a missing variance estimate, when the number of observations was small and/or odd. These bugs seem to be fixed, according to my certification program, which I have also expanded as part of this update. I have also added an additional saved result e(c), containing the rank of the original upper confidence limit used to calculate the Bonett-Price standard error (which is an example of an inverse confidence interval standard error).

I would like to thank Ariel Linden for very helpfully alerting me to these hazardous bugs, and to apologize for any users who have been inconvenienced by them.

Best wishes


Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology 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 bpmedian from

      bpmedian: Bonett-Price confidence intervals for medians and their contrasts

      bpmedian calculates a Bonett-Price confidence interval for a median,
      using the Bonett-Price standard error, and saves the results as
      estimation results.  These can then be saved in an output dataset (or
      resultsset), using the parmest package (downloadable from SSC), and
      then input to the metaparm module of the parmest package to calculate
      Bonett-Price confidence intervals for a linear contrast between
      medians of independent groups.  bpdifmed calculates Bonett-Price
      confidence intervals for the medians of two groups, defined by a
      grouping variable, and also for their difference or ratio.
      Author: Roger Newson
      Distribution-Date: 05june2009
      Stata-Version: 10

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