Summary of survey software: SUDAAN


Research Triangle Institute

Types of designs that can be accommodated.

Multiple design options allow users to analyze data from stratified, cluster sample, or multistage sample designs. Sample members may have been selected with unequal probabilities, and either with or without replacement. Any number of strata and stages can be specified. In addition, different design options may be combined in one study if different sampling methods were used for parts of the population.

Types of estimands and statistical analyses that can be accommodated.

SUDAAN includes the following statistical procedures:

Restrictions on number of variables or observations.


Primary methods used for variance estimation.

The Taylor series linearization method (GEE for regression models) is used combined with variance estimation formulas specific to the sample design. The user does not need to develop special replicate weights since the sample design can be specified directly to the program.

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

General description of the "feel" of the software.

SUDAAN uses a SAS-like language. There are two versions of Sudaan with different data interfaces: In either case, the same programming language is used.

Platforms on which the software can be run.

SUDAAN is distributed as a precompiled program.

Availability, pricing and terms.

Release 8.0 of Sudaan is the current version (see list of enhanced features ).

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.

Contact information.

SUDAAN Product Coordinator
Research Triangle Institute
3040 Cornwallis Road
Research Triangle Park NC 27709-2194
Telephone: 919-541-6602
FAX: 919-541-7431

Additional information.

SUDAAN offers public 2-day or 3-day training classes several times each year. Classes can also be taught at user sites.

The following papers about Sudaan are available on-line:

An extensive on-line help library is included for interactive use.

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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