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- W2733242457 abstract "R. C. Blair (1991) developed tables of critical values for the generalized and generalized rank sum tests that do not suffer inflation of Type I error. This study evaluated the critical values generated by Blair for situations in which sample size varies more than a maximum of a factor of two. The accuracy of the values was explored through a Monte Carlo study in which random samples were generated from populations with known characteristics. The variance in each population, the difference in population means, and the sample sizes were manipulated, with 5,000 samples of each size, from 20 size combinations, generated for each condition (equal size and three ratios of unequal sizes). Results suggest that the critical values proposed by Blair maintain the Type I error rate for the generalized t-test and generalized rank sum tests, even with sample ratios as large as 1:8, and with population variance ratios as large as 1:9. Only under small ample conditions with a sample size ratio of 1:8 and with a conservative alpha level of 0.01 did the generalized t-test not control the Type I error rate using these critical values. (Contains four tables and six references.) (SLD) *********************************************************************** * Reproductions supplied by EDRS are the best that can be made from the original document. *********************************************************************** U.S. DEPARTMENT OF EDUCATION Offic 'of Educational Research and Improvement ED ATIONAL RESOURCES INFORMATION CENTER (ERIC) This document has been reproduced as received from the person or organization originating it. Minor changes have been made to improve reproduction quality. Points of view or opinions stated in this document do not necessarily represent official OERI position or policy. , PERMISSION TO REPRODUCE AND DISSEMINATE THIS MATERIAL HAS BEEN GRANTED BY tiOnt7-6--ito 009-sew TO THE EDUCATIONAL RESOURCES INFORMATION CENTER (ERIC) Evaluation of Proposed Critical Values for the Generalized t and Generalized Rank Sum Procedures Using Unequal Sample Sizes Walter M. Chason Jeffrey D. Kromrey Department of Educational Measurement and Research University of South Florida R. Clifford Blair College of Medicine University of South Florida Paper presented at the 1996 annual meeting of the American Educational Research Association New York, NY" @default.
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- W2733242457 date "1996-04-01" @default.
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- W2733242457 title "Evaluation of Proposed Critical Values for the Generalized t and Generalized Rank Sum Procedures Using Unequal Sample Sizes." @default.
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