SUDAAN

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SUDAAN is a statistical software package for the analysis of correlated data, including correlated data encountered in complex sample surveys. SUDAAN originated in 1972 at RTI International (formerly Research Triangle Institute).

1 Current version
2 Example fields of use
3 Strengths
4 Operating systems

[edit] Current version

SUDAAN Release 9.0, released in 2004, is a single program consisting of a family of nine analytic procedures used to analyze data from complex sample surveys and other observational and experimental studies involving repeated measures and cluster-correlated data. It provides estimates that account for complex design features of a study, including:

unequally weighted or unweighted data
stratification
with- or without-replacement designs
multistage and cluster designs
repeated measures
general cluster-correlation (e.g., correlation due to multiple measures taken from patients)
multiply imputed analysis variables

[edit] Example fields of use

SUDAAN enables the analysis of correlated data encountered in various fields of statistical research, including:

survey research ([Random_digit_dialing|RDD]/telephone studies, area sample designs, cluster and stratified designs, list sampling)
clinical trials (safety and efficacy data from multiple sites in multisite trials)
group or community randomized trials
observations on related family members
toxicology (observations on littermates)
multiple subjects within a cluster (patients within physician clinics or students within school classrooms)
social statistics
health outcomes research
longitudinal data analyses
repeated measures.

[edit] Strengths

SUDAAN's strength lies it its ability to compute standard errors of ratio estimates, means, totals, regression coefficients, and other statistics in accordance with the sample design, greatly increasing the accuracy and validity of results. Many, if not most, data sets require attention to correlation and weighting, but few statistical software packages offer the user the opportunity to specify how data are correlated and weighted. While some offer limited capability, SUDAAN remains the only broadly applicable software for analysis of correlated and weighted data.

Currently, all nine of SUDAAN's analytic procedures offer three popular robust variance estimation methods:

Taylor series linearization (generalized estimation equations [GEE] for regression models)
jackknife (with or without user-specified replicate weights)
balance repeated replication (BRR).

[edit] Operating systems

SUDAAN functions on many computing platforms—including Windows 95/98/ME or NT/2000/XP, DOS, SUN/Solaris, and LINUX—either as a stand-alone statistical software tool, or in SAS-callable format (SAS Version 8 or 9).