NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Seam Bias, Multiple-State, Multiple-Spell Duration Models and the Employment Dynamics of Disadvantaged Women

John C. Ham, Xianghong Li, Lara Shore-Sheppard

NBER Working Paper No. 15151
Issued in July 2009

---- Acknowledgements -----

This paper was previously circulated under the title “Analyzing Movements over Time in Employment Status and Welfare Participation while Controlling for Seam Bias using the SIPP.” This work is supported by the NSF. We are grateful for comments received at the IRP Summer Research Workshop “Current Research on the Low-Income Population,” Madison, WI, June 19-22, 2006, as well as seminars at many universities and branches of the Federal Reserve Bank. We are particularly grateful to Geert Ridder, Melvin Stephens, Lowell Taylor and Tiemen Woutersen for suggestions that significantly improved the paper. Sandra Black, Mary Daly, Jose Lopez, Robert Moffitt, Bruce Meyer and Soohyung Lee also made very helpful remarks on an earlier draft. Eileen Kopchik provided, as usual, outstanding programming in deciphering the SIPP. Any opinions, findings and conclusions or recommendations in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. We are responsible for any errors. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.

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