An ImprovedtTable for Simultaneous Control ongContrasts
- 1 September 1977
- journal article
- research article
- Published by Taylor & Francis in Journal of the American Statistical Association
- Vol. 72 (359) , 531-534
- https://doi.org/10.1080/01621459.1977.10480607
Abstract
Assuming a constant α, tables of t were developed using the Šidák multiplicative inequality: when doing g different contrasts the familywise rate of Type 1 errors, fwi ≤ 1 − (1 − α) g . Values of t are given that yield fwi = .01, .05, .10, or .20 for number of contrasts, g = 2(1)10, 15(5)50 and degrees of freedom, v = 2(1)30, 40, 60, 120, ∞. These t values are smaller than those in the previous Dunn (1961) tables, thus yielding slightly improved power.Keywords
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