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Breakdown concepts for contingency tables

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Abstract

Loglinear Poisson models are commonly used to analyse contingency tables. So far, robustness of parameter estimators as well as outlier detection have rarely been treated in this context. We start with finite-sample breakdown points. We yield that the breakdown point of mean value estimators determines a lower bound for a masking breakdown point of a class of one-step outlier identification rules. Within a more refined breakdown approach, which takes account of the structure of the contingency table, a stochastic breakdown function is defined. It returns the probability that a given proportion of outliers is randomly placed at such a pattern, where breakdown is possible. Finally, the introduced breakdown concepts are applied to characterise the maximum likelihood estimator and a median-polish estimator.

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  1. Department of Mathematics and Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands

    Sonja Kuhnt

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  1. Sonja Kuhnt
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Correspondence to Sonja Kuhnt.

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Kuhnt, S. Breakdown concepts for contingency tables. Metrika 71, 281–294 (2010). https://doi.org/10.1007/s00184-008-0230-3

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