Letters to the Editors
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I refer to OlguõÂ n and Fearn (1997) and to Bissell (1989, 1992), in which I oered a simple -test for determining whether any mean squares in a saturated n-design indicate signi®cant eects
n 2 or more levels of each factor, k is the number of eects and thus nÿ 1 is the number of degrees of freedom per eect and there are k mean squares each on degrees of freedom in the analysis of variance). In Bissell (1989, 1992) I showed that, if the mean and variance of these mean squares, m and s, are calculated, then under the null hypothesis