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  Access Rights: Use restricted to UNT Community
  Partner: UNT Libraries
 Department: Department of Counseling, Development and Higher Education
 Degree Discipline: Psychology
 Collection: UNT Theses and Dissertations
Simulating Statistical Power Curves with the Bootstrap and Robust Estimation

Simulating Statistical Power Curves with the Bootstrap and Robust Estimation

Access: Use of this item is restricted to the UNT Community.
Date: August 2001
Creator: Herrington, Richard S.
Description: Power and effect size analysis are important methods in the psychological sciences. It is well known that classical statistical tests are not robust with respect to power and type II error. However, relatively little attention has been paid in the psychological literature to the effect that non-normality and outliers have on the power of a given statistical test (Wilcox, 1998). Robust measures of location exist that provide much more powerful tests of statistical hypotheses, but their usefulness in power estimation for sample size selection, with real data, is largely unknown. Furthermore, practical approaches to power planning (Cohen, 1988) usually focus on normal theory settings and in general do not make available nonparametric approaches to power and effect size estimation. Beran (1986) proved that it is possible to nonparametrically estimate power for a given statistical test using bootstrap methods (Efron, 1993). However, this method is not widely known or utilized in data analysis settings. This research study examined the practical importance of combining robust measures of location with nonparametric power analysis. Simulation and analysis of real world data sets are used. The present study found that: 1) bootstrap confidence intervals using Mestimators gave shorter confidence intervals than the normal theory counterpart ...
Contributing Partner: UNT Libraries