TY - JOUR A1 - Schafer, J.L. A1 - Olsen, M.K. T1 - Multiple imputation for multivariate missing-data problems: A data analyst's perspective Y1 - 1998 DO - 10.1207/s15327906mbr3304_5 JF - Multivariate Behavioral Research VL - 33 IS - 4 ER -