SEGMENTED ASSIMILATION THEORY: A REFORMULATION AND EMPIRICAL TEST * Yu Xie Emily Greenman University of Michigan _____________ * An earlier version of the paper was presented at the 2005 Population Association of America Annual Meeting (April, Philadelphia). Direct all correspondence to Yu Xie (e-mail: yuxie@umich.edu ) or Emily Greenman (e-mail: egreenma@umich.edu ) at Population Studies Center, Institute for Social Research, 426 Thompson Street, University of Michigan, Ann Arbor, MI 48106. The research is supported by a research grant to Yu Xie and a traineeship to Emily Greenman from the National Institute of Child Health and Development. We thank Richard Alba, Victor Nee, and Tony Perez for comments on an earlier version of this paper.