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ERIC Number: EJ896133
Record Type: Journal
Publication Date: 2010
Pages: 30
Abstractor: As Provided
Reference Count: 20
ISSN: ISSN-0211-2159
A New Nonparametric Levene Test for Equal Variances
Nordstokke, David W.; Zumbo, Bruno D.
Psicologica: International Journal of Methodology and Experimental Psychology, v31 n2 p401-430 2010
Tests of the equality of variances are sometimes used on their own to compare variability across groups of experimental or non-experimental conditions but they are most often used alongside other methods to support assumptions made about variances. A new nonparametric test of equality of variances is described and compared to current "gold standard" method, the median-based Levene test, in a computer simulation study. The simulation results show that when sampling from either symmetric or skewed population distributions both the median based and nonparametric Levene tests maintain their nominal Type I error rate; however, when one is sampling from skewed population distributions the nonparametric test has more statistical power. (Contains 12 figures, 5 tables, and 1 footnote.)
University of Valencia. Dept. Metodologia, Facultad de Psicologia, Avda. Blasco Ibanez 21, 46010 Valencia, Spain. Tel: +34-96-386-4100; Web site:
Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A