Abstract
Due to the extension of the Shapiro and Wilk W test by Shapiro and Francia (1972) a new power study of the D test (D' Agostino, 1971) is presented for sample size n=100. For most alternatives the D testcompares favorably with the.W' test of Shapiro and Francia and the traditional tests. However, itspowers for some skewed alternatives with less than normal kurtosis (β2<3) are low. Also presented are power values for the- contaminated normals of Chen (1971b) for n=20, 50 and 100. Forlocation contaminated normals the W and W' tests are either as goodorbetter than D. While for scale contaminated normals D is as good orbetter than W and W'.
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