- MULTILOG: Fits multinomial logistic regression models to ordinal and nominal categorical data and computes hypothesis tests for model parameters. Estimates odds ratios and their 95% confidence intervals for each model parameter. Has GEE (Generalized Estimating Equation) modeling capabilities for efficient parameter estimation.
- REGRESS: Fits linear regression models to continuous outcomes and performs hypothesis tests concerning the model parameters.
- LOGISTIC: Fits logistic regression models to binary data and computes hypothesis tests for model parameters. Estimates odds ratios and their 95% confidence intervals for each model parameter.
- SURVIVAL: Fits proportional hazards (Cox regression) models to failure time data. Estimates hazard ratios and their 95% confidence intervals for each model parameter.
- CROSSTAB: Computes frequencies, percentage distributions, odds ratios, relative risks, and their standard errors (or confidence intervals) for user-specified cross-tabulations, as well as chi-square tests of independence and the Cochran-Mantel-Haenszel chi-square test for stratified two-way tables.
- DESCRIPT: Computes estimates of means, totals, proportions, percentages, geometric means, quantiles, and their standard errors. Also computes standardized estimates and tests of single degree-of-freedom contrasts among levels of a categorical variable.
- RATIO: Computes estimates and standard errors of generalized ratios of the form (Summation y) / (Summation x), where x and y are observed variables. Also computes standardized estimates and tests single-degree-of-freedom contrasts among levels of a categorical variable.
- The EFFECT statement allows users to specify contrasts of regression coefficients and hypothesis tests using simple effect names.

Jackknife and Balanced Repeated Replication (BRR) variance estimation is also supported.

- "SAS-callable" Sudaan: SUDAAN is called directly as a SAS procedure.
- "Standalone Sudaan": Independent program that reads external file formats, including SAS files or SPSS files.

- PCs under Windows 95 or later versions. This is now the primary platform for Sudaan.
- Sun SPARC computers under Solaris 2.6 and up.

SUDAAN is available under annual site licenses. Annual academic site license renewal prices range from $60 to $385 per user (depending on volume), with new licenses costing about twice as much. Government and commercial annual site license prices range from $65 to $735 per user depending on product and volume See pricing details at Sudaan Web site.

Research Triangle Institute

3040 Cornwallis Road

Research Triangle Park NC 27709-2194

Telephone: 919-541-6602

FAX: 919-541-7431

Email:

`SUDAAN@rti.org`

URL:

`http://www.rti.org/sudaan/`

The following papers about Sudaan are available on-line:

- Full help manual may be viewed on-line.
- Bieler and Williams (1996), "Application of the SUDAAN Software Package to Clustered Data Problems: Pharmaceutical Research."
- "Analyzing Repeated Measures and Cluster-Correlated Data Using SUDAAN Release 7.5" (1997).
- "Analyzing Survey Data Using SUDAAN Release 7.5" (1997, compares Taylor series, jackknife and BRR variance estimates)

This software is discussed in the review
article from *The Survey Statistician*.

See also Shah and Barnwell (1993), "Recent developments and future
plans for SUDAAN" in *Proceedings of the Survey Research Methods
Section, ASA*, 657-661.

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