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Nabaz Esmailzadeh

Nabaz Esmailzadeh

Academic rank: Assistant Professor
ORCID:
Education: PhD.
ScopusId: 36650551000
Faculty: Faculty of Science
Address: Sanandaj -University of Kurdistan-Department of Statistics
Phone: +98-87-33664601-2476

Research

Title
A Comparison of Five Bootstrap and Non-Bootstrap Levene-Type Tests of Homogeneity of Variances
Type
JournalPaper
Keywords
Alexander and Govern’s test, James’s test, Estimated critical value, Heteroscedastic alternatives to ANOVA F test, Levene’s test , Structural zeros
Year
2019
Journal Iranian Journal of Science and Technology Transaction A-Science
DOI
Researchers Nabaz Esmailzadeh

Abstract

The test of homogeneity of variances arises in various statistical problems. In this paper, we compared five Levene-type tests including Levene’s test, Welch’s test, James’s test, Brown and Forsythe’s test and Alexander–Govern’s test in terms of power and size. The simulation results show that the bootstrapping after applying Noguchi and Gel (J Nonparametr Stat 22:897–913, 2010) correction and removing structural zeros significantly improve the performance of Type I error rates. We identify the best in terms of controlling the Type I error rate and power for each number of groups.