Comparing Two Dependent Groups: Dealing with Missing Values

The paper considers the problem of comparing measures of location associated with two dependent groups when values are missing at random, with an emphasis on robust measures of location. It is known that simply imputing missing values can be unsatisfactory when testing hypotheses about means, so the goal here is to compare several alternative strategies that use all of the available data. Included are results on comparing means and a 20% trimmed mean. Yet another method is based on the usual median but differs from the other methods in a manner that is made obvious. (It is somewhat related to the formulation of the Wilcoxon-Mann-Whitney test for independent groups.) The strategies are compared in terms of Type I error probabilities and power.

並列關鍵字

Bootstrap methods ； medians ； trimmed means

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Comparing Two Dependent Groups: Dealing with Missing Values

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