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2014-03-17
I am interested in the analysis of longitudinal data such as clinical trials with nonignorable dropout/missing.  I could find some references regarding the approaches of how to analyze data under both assumptions. However, little was found on how to test the missing is NMAR or MAR.   Would appreciate it if anyone can introduce me some reference on this topic.  Thanks.

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2014-3-17 22:54:32
Good morning

There also seems to be a consensus among the experts that if auxiliary' variables are added to the imputation model, in addition to the covariates in the analysis model, missingness may be better explained, and the MAR assumption may become more plausible

References
  • Graham JW. Missing Data. Analysis and Design. Series: Statistics for Social and Behavioral Sciences.2012. Springer New York.
  • van Buuren S, Flexible Imputation of Missing Data (2012), Chapman & Hall/CRC
  • White, I.R., Royston, P., and Wood, A.M. (2011). Multiple imputation using chained equations: Issues and guidance for practice. Statistics in Medicine 30:377-399.
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2014-3-17 23:41:21
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