On the use of a log-rate model for survey-weighted categorical data

Thomas M. Loughin, Christopher R. Bilder

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

For the analysis of survey-weighted categorical data, one recommended method of analysis is a log-rate model. For each cell in a contingency table, the survey weights are averaged across subjects and incorporated into an offset for a loglinear model. Supposedly, one can then proceed with the analysis of unweighted observed cell counts. We provide theoretical and simulation-based evidence to show that the log-rate analysis is not an effective statistical analysis method and should not be used in general. The root of the problem is in its failure to properly account for variability in the individual weights within cells of a contingency table. This results in goodness-of-fit tests that have higher-than-nominal error rates and confidence intervals for odds ratios that have lower-than-nominal coverage.

Original languageEnglish (US)
Pages (from-to)2661-2669
Number of pages9
JournalCommunications in Statistics - Theory and Methods
Volume40
Issue number15
DOIs
StatePublished - Jan 2011

Keywords

  • Clogg-Eliason
  • Contingency table
  • Loglinear model
  • Offset
  • Rao-Scott
  • Survey sampling

ASJC Scopus subject areas

  • Statistics and Probability

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