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Activity Number: 445
Type: Contributed
Date/Time: Tuesday, August 11, 2015 : 2:00 PM to 3:50 PM
Sponsor: Survey Research Methods Section
Abstract #315185
Title: Examples of Singletons for Which Variance Software Fix-Ups Are Not Adequate
Author(s): Iris Shimizu* and Roberto Valverde
Companies: National Center for Health Statistics and National Center for Health Statistics
Keywords: Singleton units ; variance estimates ; software ; fix-ups
Abstract:

Variance computation requires the presence of two or more units from each stratum in the population. However, in sampling practice, the final data set may include "singleton" strata (i.e. with single sample observations). To enable variance estimation in the presence of singletons, statisticians must apply fixups. Some, if not all, of the currently available statistical software include fixups which statisticians may select to enable the software to approximate variances when singletons are present in the data set. However, anomalies in variance results produced by some software fixups have been observed for some singleton situations. Some examples of those singleton situations and the resulting anomalous variances are presented in this paper along with descriptions of manual fixups applied to eliminate the observed anomalies.

Authors who are presenting talks have a * after their name.

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