ERIC Number: ED050141
Record Type: RIE
Publication Date: 1971-Feb
Reference Count: 0
An Empirical Investigation of the Effect of Unequal Variances on the Permutation t-test.
Toothaker, Larry E.
Various cases of unequal variances and unequal sample sizes from a normal and a skewed population were used to empirically obtain the probability of a Type I error and the power for the permutation t-test as compared to Student's t-test and the Mann-Whitney U-test. Empirical results showed differences for different sample sizes, variance ratios, population sampled, and size of mean of the population. The power of the permutation t-test is very close to or greater than that of Student's t-test for both populations, and the power is large if the large variance accompanied the large mean for the skewed population. (Author)
Publication Type: N/A
Education Level: N/A
Authoring Institution: Oklahoma Univ., Norman.
Identifiers: Permutation t test
Note: Paper presented at the Annual Meeting of the American Educational Research Association, New York, New York, February 1971