TY - JOUR A1 - Fitzgerald, J. A1 - Gottschalk, P. A1 - Moffitt, R. T1 - An analysis of sample attrition in panel data: The Michigan Panel Study of Income Dynamics Y1 - 1998 DO - 10.2307/146433 JF - Journal of Human Resources VL - 33 IS - 2 ER -