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The POWER Procedure |
The hypotheses are
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where is the number of groups,
are the contrast coefficients, and
is the null contrast value.
The test is the usual test for a contrast in one-way ANOVA. It assumes normal data with common group variances and requires
and
.
O’Brien and Muller (1993, Section 8.2.3.2) give the exact power as
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where
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The hypotheses are
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where is the number of groups.
The test is the usual overall test for equality of means in one-way ANOVA. It assumes normal data with common group variances and requires
and
.
O’Brien and Muller (1993, Section 8.2.3.1) give the exact power as
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where the noncentrality is
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and
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