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Power (Statistics)2
Sampling2
Computer Oriented Programs1
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Educational and Psychological…2
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Algina, James2
Hombo, Catherine M.1
Nthangeni, Mbulaheni1
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Power Calculation for Independent Samples Hotelling's T2 Using PROC IML IN SAS.
Peer reviewed Peer reviewed
Algina, James; Hombo, Catherine M. – Educational and Psychological Measurement, 1998
The Statistical Analysis System (SAS) has been used to program power calculations for the independent samples Hotellings T squared. Three programs have been prepared to accommodate variations in the information that may be available to do the power analysis. (Author/SLD)
Descriptors: Computer Oriented Programs, Power (Statistics), Sampling
Type I Error Rate and Power of Some Alternative Methods to the Independent Samples "t" Test.
Peer reviewed Peer reviewed
Nthangeni, Mbulaheni; Algina, James – Educational and Psychological Measurement, 2001
Examined Type I error rates and power for four tests for treatment control studies in which a larger treatment mean may be accompanied by a larger treatment variance and examined these aspects of the independent samples "t" test and the Welch test. Evaluated each test and suggested conditions for the use of each approach. (SLD)
Descriptors: Control Groups, Power (Statistics), Research Design, Sampling