ERIC Number: ED074081
Record Type: RIE
Publication Date: 1973-Feb
Reference Count: 0
The Effects of Variance Heterogeneity on Simultaneous Multiple Comparison Procedures with Equal Sample Size.
Howell, John F.; Games, Paul A.
The two purposes of this investigation were to study the effects of variance heterogeneity on three selected multiple comparison procedures and to determine if either of two nonstandard methods would be superior to the conventional methods based on mean square within. The three procedures studied were the Wholly Significant Difference Test (WSD), The "S" test, and a simple multiple "t" test (MTT) procedure. The investigation was a computer simulation consisting of 1000 experiments with four independent samples of five data points. Six pairwise contrasts were considered. The four variance conditions (VC) constituted one factor of the design. Each of the six contrasts were tested using three methods. The three methods constituted a second factor in the two-factor design with VC crossed with method. Results are tabulated and discussed. (DB)
Publication Type: N/A
Education Level: N/A
Authoring Institution: N/A
Note: Paper presented at the American Educational Research Association Convention, February 1973