TY - JOUR A1 - Papke, L. E. A1 - Wooldridge, J. M. T1 - Econometric methods for fractional response variables with an application to 401(k) plan participation rates Y1 - 1996 DO - 10.1002/(SICI)1099-1255(199611)11:6<619::AID-JAE418>3.0.CO;2-1 VL - 11 ER -