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SAS

The following SAS programs can be used by everybody. Click on the name of the program of your choice to save the file to your hard disk.

You need the
SAS module BASE and the other modules listed below to submit the programs successfully during a SAS session.
The programs are written and tested for use with SAS versions 6 (Release 6.12), 8 (Release 8.2), and 9 (Release 9.1.3 and 9.2).
The references can be found on my bibliography page.


Name Size SAS Version Required SAS Modules References Description
nnt_adj.sas 12.8 K Versions
8 and 9
STAT, IML Bender & Vervölgyi (2011)
Bender & Vervölgyi (2010)
Estimation of the number needed to treat (NNT) with adjustment for balanced covariates based upon the average risk difference approach within the framework of logistic regression.
pin_nnt_ci.sas 6.6 K Versions
6, 8, 9
STAT, IML Bender & Grouven (2008)
Bender (2001)
Calculation of confidence intervals for the population impact number (PIN) and the number needed to treat (NNT) based upon the Wilson score method.
nne_ein.sas 13.6 K Versions
8 and 9
STAT, IML Bender, Kuß, Hildebrandt & Gehrmann (2007) Estimation of the number needed to be exposed (NNE) and the exposure impact number (EIN) with adjustment for confounding variables based upon the average risk difference approach within the framework of logistic regression.
nne_v8b.sas 13.1 K Versions
8 and 9
STAT, IML Bender, Hildebrandt & Kuß (2006) A refined method to estimate the number needed to be exposed (NNE) with adjustment for confounding variables by means of logistic regression.
nne_v8.sas 10.1 K Versions
8 and 9
STAT, IML Bender & Blettner (2002) Estimation of the number needed to be exposed (NNE) with adjustment for confounding variables by means of logistic regression.
This program should be used only if the distribution of confounders is narrow!
In other cases it is recommended to use the program nne_ein.sas (see above).
nne_v6.sas 10.1 K Version 6 STAT, IML
nnt_ci.sas 7.4 K Versions
6, 8, 9
STAT, IML Bender (2000a)
Bender (2000b)
Bender (2001)
Calculation of confidence intervals for the number needed to treat (NNT) based upon the Wilson score method.
bench_v8.sas 7.9 K Versions
8 and 9
STAT, GRAPH, IML Bender (1999) Estimation of the benchmark values VARL and VARG, SDs, and CIs based upon the logistic function.
bench_v6.sas 7.9 K Version 6 STAT, GRAPH, IML
lognar.sas 3.7 K Versions
6, 8, 9
STAT, ETS, GRAPH Bender & Heinemann (1995) Fitting of lognormal functions with autoregressive errors to unimodal curves.
frieholm.sas 6.2 K Versions
6, 8, 9
STAT, IML Bender (1993) Friedman test with adjustment for ties and multiple comparisons by using the Holm procedure.



SPSS

The SPSS program
nne_ein.sps is the SPSS version of the SAS macro nne_ein.sas. It can be used to calculate the number needed to be exposed (NNE) and the exposure impact number (EIN) with adjustment for confounding variables based upon the average risk difference approach within the framework of logistic regression (see Bender, Kuß, Hildebrandt & Gehrmann (2007)).

The SPSS program nne_ein.sps was written by Andrew Mackinnon from the University of Melbourne, Australia.
It is written and tested for use with SPSS versions 15 and 16.



S-Plus

The S-Plus function
crback.setup can be used to calculate continuation ratio models for ordinal data using backward continuation ratios (see Bender & Benner, 2000). To use this function it is necessary to install the Design and probably the Hmisc Library provided by Frank Harrell (Vanderbilt University, School of Medicine).

The function crback.setup was written by my colleague Axel Benner (DKFZ, Heidelberg) by modifying the original cr.setup function contained in the Design Library.



Cool Links My favourite software links:
  • StatLib hosted by the Dept. of Statistics, Carnegie Mellon University
  • Web pages that perform statistical calculations collected by John C. Pezzullo
  • FTP-Server of the University of Heidelberg, Germany
  • SAS Institute
  • Cytel Software Corporation


  • Do you have a question or a comment?

    Send me a mail   E-Mail Ralf@rbsd.de

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    © 17.10.2012 Ralf Bender