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Activity Number: 481
Type: Contributed
Date/Time: Wednesday, August 9, 2006 : 2:00 PM to 3:50 PM
Sponsor: General Methodology
Abstract - #307532
Title: Free SAS/IML (r) Software for Computing Confidence Limits for Power in the Univariate and Multivariate Approaches to Repeated Measures
Author(s): Jacqueline Johnson*+ and Matthew Gribbin and Sola Park and Keith E. Muller
Companies: The University of North Carolina at Chapel Hill and The University of North Carolina at Chapel Hill and The University of North Carolina at Chapel Hill and The University of North Carolina at Chapel Hill
Address: 700 Bolinwood Drive, Apt. 24G, Chapel Hill, NC, 27514,
Keywords: linear models ; repeated measures ; power
Abstract:

We describe the latest version of free software which provides convenient power calculations for a wide range of multivariate linear models with Gaussian errors, including the "univariate" (UNIREP) and "multivariate" (MULTIREP) approaches to repeated measures, as well as a limited but useful range of mixed models. New in this version are computations for approximate confidence limits for power for the Box, Geisser-Greenhouse, Huynh-Feldt, and uncorrected UNIREP tests and exact confidence limits for power for the Wilks, Pillai Bartlett, and Hotelling-Lawley MULTIREP tests. These confidence limits may be requested for any power value to reflect the uncertainty due to using any combination of estimated variances and means. We give several examples will to illustrate use.

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