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Nittner, T.; Toutenburg, Helge (2004): Identifying Missing Data Mechanisms in (2 x 2)-Contingency Tables. Sonderforschungsbereich 386, Discussion Paper 373
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Abstract

Consider the sample of two binary variables X and Y with some missing structure within X or Y. The knowledge about the corresponding values of the observed covariate allows to play through all possible `originally' complete data sets. After defining the notation, including some theoretical work, a test for non--MCAR within the complete case table is presented. Simulating all possible tables enables some testing on non--MAR. A simulation experiment is used to illustrate this context.