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. |

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.

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.

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