Unweighted Sum of Squares Test for Proportions

J. B. Copas

Journal of the Royal Statistical Society Series C, 1989, vol. 38, issue 1, 71-80

Abstract: The x2 test for proportions (or for independence in a 2 x m contingency table) requires that expected frequencies are not too small. An alternative to amalgamating low frequencies is to retain them but to give them less weight in the analysis. The resulting modified x2 test is also motivated by a likelihood argument based on a random effects model for the true proportions. The test works well in an example concerning error rates in computer records.

Date: 1989
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