Increased power with modified forms of the Levene (Med) test for heterogeneity of variance.
While the conventional Levene (Med) test is a widely used and robust test for detecting heterogeneity of variance, it does not take notice of either the linear dependencies among the residuals involved or the possibility of a mean (or median)-variance relationship. This paper explores the substantial improvements in power possible by investigating the benefits both of removing such linear dependencies (structural zeros) and of modeling (even roughly) such relationships.
Hines
W G
WG
Department of Mathematics and Statistics, University of Guelph, Ontario, Canada. ghines@uoguelph.ca
Hines
R J
RJ
D000704:Analysis of Variance; D001699:Biometry / Q000379:methods*; D015233:Models, Statistical; D011897:Random Allocation; D015203:Reproducibility of Results