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st: Issues of Normality for Multiple Imputation with ICE


From   "McDonald, Catherine" <mcdonalc@nursing.upenn.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Issues of Normality for Multiple Imputation with ICE
Date   Fri, 9 Oct 2009 10:48:57 -0400

Hello-

I am working with a small data set with missing values for which I am trying to do multiple imputation with ICE. I have some data that are non-normal. Do I have to do transformations? I have seen a reference to Schafer (Analysis of incomplete Multivariate Data 1997) that says there is evidence that imputation methods can work even when the data are not normal. But I did not know if the ICE command would be one of these methods. Is there a ref that would support leaving non-normal data as is for multiple imputation with ICE? Are there steps that I need to take? What options for transformations would be possible? 

Thank you very much-
Catherine 




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