Abstract
Abstract In this paper we present a simple diagnostic two-stage test for nonadditivity in log-linear and logit models. The rationale and procedure are similar to that of tests presented by Milliken and Graybill (1970) for linear models. We show that the test is asymptotically chi-squared and we present an example comparing the test procedure to one based on maximum likelihood. An advantage of the new test procedure is that no special software is required, since it can be performed using generalized linear model software.
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