TY - RPRT A1 - Watkins, S. C. A1 - Adams, J. A1 - Anglewicz, P. A1 - Helleringer, S. A1 - Manyamba, C. A1 - Mwera, J. A1 - Reniers, G. A1 - Weinreb, A. T1 - A Rose by Any Other Name: Identifying Elusive and Eager Would-be Respondents in Longitudinal Data Collection Y1 - 2006 PB - Population Studies Center, University of Pennsylvania CY - Philadelphia IS - Working Paper ER -