In the last twenty years there has been an explosion of economic research on labor force dynamics, the movement of individuals between labor force states. The recent book by Devine and Kiefer (1991) provides an annotated bibliography of over 100 studies and a reference list of over 500 studies. Indicative of the literature's maturity, there are now several excellent surveys which are either devoted to specific components of the literature or to providing a more general overview. l * There are also articles and books devoted to the statistical methodology for the analysis of transition data that use as a primary substantive focus the topic of labor force dynamics.2