Specialized Tests for Detecting Treatment Effects in the Two-Sample Problem

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dc.contributor.authorKeselman, H. J.
dc.contributor.authorCribbie, Robert
dc.contributor.authorZumbo, Bruno
dc.date.accessioned2018-06-04T15:14:24Z
dc.date.available2018-06-04T15:14:24Z
dc.date.issued1997
dc.description.abstractNonparametric and robust statistics (those using trimmed means and Winsorized variances) were compared for their ability to detect treatment effects in the 2-sample case. In particular, 2 specialized tests, tests designed to be sensitive to treatment effects when the distributions of the data are skewed to the right, were compared with 2 nonspecialized nonparametric (Wilcoxon-Mann-Whitney; Mann & Whitney, 1947; Wilcoxon, 1949) and trimmed (Yuen, 1974) tests for 6 nonnormal distributions that varied according to their measures of. skewness and kurtosis. As expected, the specialized tests provided more power to detect treatment effects, particularly for the nonparametric comparison. However, when distributions were symmetric, the nonspecialized tests were more powerful; therefore, for all the distributions investigated, power differences did not favor the specialized tests. Consequently, the specialized tests are not recommended; researchers would have to know the shapes of the distributions that they work with in order to benefit from specialized tests. In addition, the nonparametric approach resulted in more power than the trimmed-means approach did.en_US
dc.description.sponsorshipSocial Sciences and Humanities Research Council
dc.identifier.citationKeselman, H. J., Cribbie, R., & Zumbo, B. D. (1997). Specialized tests for detecting treatment effects in the two-sample problem. The Journal of experimental education, 65(4), 355-366. https://doi.org/10.1080/00220973.1997.10806610
dc.identifier.urihttps://doi.org/10.1080/00220973.1997.10806610en_US
dc.identifier.urihttp://hdl.handle.net/10315/34606
dc.language.isoenen_US
dc.publisherTaylor & Francisen_US
dc.rights.articlehttps://www.tandfonline.com/doi/abs/10.1080/00220973.1997.10806610
dc.subjectnonparametric testsen_US
dc.subjectrobust statisticsen_US
dc.subjecttreatment effecten_US
dc.titleSpecialized Tests for Detecting Treatment Effects in the Two-Sample Problem
dc.typeArticleen_US

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