To Trim or Not To Trim: Tests of Location Equality under Heteroscedasticity and Nonnormality

To Trim or Not To Trim: Tests of Location Equality under Heteroscedasticity and Nonnormality

Comparison of six procedures to test for location equality among two or more groups when population variances are heterogeneous suggests that, when the variance homogeneity and normality assumptions are not satisfied, and the design is unbalanced, the use of any of these test statistics with the usu...

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Veröffentlicht in:Educational and psychological measurement 1998-06, Vol.58 (3), p.409-429
Hauptverfasser: Lix, Lisa M, Keselman, H. J
Format: Artikel
Sprache:eng
Schlagworte:
Analysis of variance
Biological and medical sciences
Comparative Analysis
Equality (Mathematics)
Estimation (Mathematics)
Fundamental and applied biological sciences. Psychology
Heteroscedasticity
Heteroscedasticity (Statistics)
Least Squares Statistics
Nonnormal Distributions
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychometrics. Statistics. Methodology
Research Design
Statistics
Statistics. Mathematics
Testing
Tests
Trimmed Means
Type I Errors
Variance (Statistical)
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Zusammenfassung:Comparison of six procedures to test for location equality among two or more groups when population variances are heterogeneous suggests that, when the variance homogeneity and normality assumptions are not satisfied, and the design is unbalanced, the use of any of these test statistics with the usual least squares estimators is not recommended. (SLD)
ISSN:0013-1644
1552-3888
DOI:10.1177/0013164498058003004