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Effective directed tests for models with ordered categorical data

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Summary

This paper offers a new method for testing one-sided hypotheses in discrete multivariate data models. One-sided alternatives mean that there are restrictions on the multidimensional parameter space. The focus is on models dealing with ordered categorical data. In particular, applications are concerned with R×C contingency tables. The method has advantages over other general approaches. All tests are exact in the sense that no large sample theory or large sample distribution theory is required. Testing is unconditional although its execution is done conditionally, section by section, where a section is determined by marginal totals. This eliminates any potential nuisance parameter issues. The power of the tests is more robust than the power of the typical linear tests often recommended. Furthermore, computer programs are available to carry out the tests efficiently regardless of the sample sizes or the order of the contingency tables. Both censored data and uncensored data models are discussed.
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Keywords: Wilcoxon-Mann-Whitney statistic; censored data; chi-squared statistic; concordance monotonicity; directed tests; pool-adjacent-violators algorithm; stochastic order alternative; treatment vs control

Document Type: Research Article

Affiliations: Rutgers University

Publication date: September 1, 2003

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