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- Title
Randomization tests and the unequal-N/unequal-variance problem.
- Authors
MEWHORT, D. J. K.; KELLY, MATTHEW; JOHNS, BRENDAN T.
- Abstract
When both the variance and the N are unequal in a two-group design, the probability of a Type I error shifts from the nominal 5% error rate. The probability is too liberal when the small cell has the larger variance and too conservative when the large cell has the larger variance. We present an algorithm to circumvent the problem when the smaller group has the larger variance and show, by simulation, that the algorithm brings the error rate back to the nominal value without sacrificing the ability to detect true effects.
- Subjects
STOCHASTIC processes; VARIANCES; PROBABILITY theory; ERROR rates; COMPUTER algorithms; COMPUTER simulation
- Publication
Behavior Research Methods, 2009, Vol 41, Issue 3, p664
- ISSN
1554-351X
- Publication type
Article
- DOI
10.3758/BRM.41.3.664