The determination of job similarities and differences is important for several reasons. First, to satisfy legal requirements concerning validity generalizations and second, to justify in some circumstances, collapsing across jobs for validational purposes. The proposed Analysis of Variance procedure allows researchers to test for significant differences among jobs. Moreover, the procedure permits the calculation of variance estimates to estimate the relative degree of similarities and differences among jobs. An example is presented.
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Arvey et al. (1977) studied this question.
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