Abstract #301301

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JSM 2003 Abstract #301301
Activity Number: 254
Type: Contributed
Date/Time: Tuesday, August 5, 2003 : 12:00 PM to 1:50 PM
Sponsor: Section on Statistical Computing
Abstract - #301301
Title: Free Power Software for Repeated Measures, MANOVA, and Some Mixed Linear Models Using SAS/IML (r)
Author(s): Jacqueline L. Johnson*+ and James C. Slaughter and Keith E. Muller
Companies: UNC and University of North Carolina and University of North Carolina, Chapel Hill
Address: #627, Carrboro, NC, 27510-1600,
Keywords: Wilks test ; Pillai-Bartlett test ; Hotelling-Lawley test ; Box Conservative test ; Geisser-Greenhouse test ; Huynh-Feldt test
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. The "multivariate" and "univariate" approaches to repeated measures, as well as MANOVA tests, are covered. Power for a limited but useful range of mixed models may also be computed, with a careful and appropriate choice of inputs. F approximations are used throughout, and are reduced to exact forms whenever possible. Wilks, Pillai-Bartlett, Hotelling-Lawley tests are covered. Power for the Box conservative test has been added. Geisser-Greenhouse, Huynh-Feldt, and uncorrected test approximation accuracy has been improved. Confidence limits may be requested for any power value to reflect the uncertainty due to using any combination of estimated variances and means. Automatically available output files simplify producing plots and tables for manuscripts. The documentation has been expanded to include a wider range of examples for both UNIX and Windows systems.

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