1. Analysis of incomplete multivariate data;Schafer,1997
2. Multiple imputation: a primer;Schafer;Stat Methods Med Res,1999
3. Multiple imputation: current perspectives;Kenward;Stat Methods Med Res,2007
4. Multiple imputation for nonresponse in surveys;Rubin,1987
5. STATA multiple-imputation reference manual (release 11),2009