Conventional And Robust Paired And Independent-Samples t Tests: Type I Error And Power Rates

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Published Nov 1, 2003
DOI : https://doi.org/10.22237/jmasm/1067646120

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Katherine Fradette
Department of Psychology, University of Manitoba
H. J. Keselman
Department of Psychology, University of Manitoba
Lisa Lix
Department of Community Health Sciences, University of Manitoba
James Algina
Department of Educational Psychology, University of Florida
Rand R. Wilcox
Department of Psychology, University of Southern California

Abstract

Monte Carlo methods were used to examine Type I error and power rates of 2 versions (conventional and robust) of the paired and independent-samples t tests under nonnormality. The conventional (robust) versions employed least squares means and variances (trimmed means and Winsorized variances) to test for differences between groups.

Article Details

Issue
Vol. 2 (2003): Issue 2
Section
Articles