st: New package -punafcc- for SSC

["Roger B. Newson" <r.newson@imperial.ac.uk>]

Thanks as always to Kit Baum, a new package -punafcc- is now available 
for download from SSC. In Stata, use the -ssc- command to do this.

The -punafcc- command is described as below on my website, and estimates 
population unattributable and attributable fractions for case-control or 
survival studies after a logistic or Cox regression model has been 
fitted. It currently has the limitation that it cannot do this if the 
model contains factor interactions involving the exposure of interest, 
which varies between scenarios. However, there are work-arounds to solve 
this problem, and these are discussed in the on-line help. (I hope to 
revisit this issue in future.)

I would like to thank all at StataCorp for providing the very impressive 
-margins- command that made -punafcc- possible. I would particularly 
like to thank Kristin MacDonald, Jennifer Rolfes, Miguel Dorta and Jeff 
Pitblado, who have all helped me (very patiently) with my complicated 
and very demanding -margins- queries arising from the development of 
-punafcc- and -punaf-.

Best wishes

Roger


--
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
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: r.newson@imperial.ac.uk
Web page: http://www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/

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

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package punafcc from http://www.imperial.ac.uk/nhli/r.newson/stata12
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TITLE
      punafcc: Population attributable fractions for case-control and 
survival studies

DESCRIPTION/AUTHOR(S)
      punafcc calculates confidence intervals for population attributable
      and unattributable fractions in case-control or survival studies.
      punafcc can be used after an estimation command whose parameters are
      interpreted as log rate ratios, such as logit or logistic for
      case-control data, or stcox for survival data.  It estimates the log
      of the mean rate ratio, in cases or deaths, between 2 scenarios, a
      baseline scenario ("Scenario 0") and a fantasy scenario ("Scenario
      1"), in which one or more exposure variables are assumed to be set
      to particular values (typically zero), and any other predictor
      variables in the model are assumed to remain the same.  This ratio
      is known as the population unattributable fraction (PUF), and is
      subtracted from 1 to derive the population attributable fraction
      (PAF), defined as the proportion of the cases or deaths attributable
      to living in Scenario 0 instead of Scenario 1.

      Author: Roger Newson
      Distribution-Date: 28october2011
      Stata-Version: 12

INSTALLATION FILES                                  (click here to install)
      punafcc.ado
      punafcc_p.ado
      punafcc.sthlp
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