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On the Distribution of Summary Statistics for Missing Data
B M Ringham1, S M Kreidler2, K E Muller3
1Department of Biostatistics and Informatics, University of Colorado Denver.
Abstract:
Under an assumption that missing values occur randomly in a matrix, formulae are developed for the expected value and variance of six statistics that summarize the number and location of the missing values. For a seventh statistic, a regression model based on simulated data yields an estimate of the expected value. The results can be used in the development of methods to control the Type I error and approximate power and sample size for multilevel and longitudinal studies with missing data.
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