`` `` this paper considers the formulation , estimation and interpretation of microdynamic models of fertility . our model explains parity choices , sterility , childlessness , interbirth intervals and initiation of pregnancy within a unified framework . we develop a general methodology for estimating the determinants of transition times to births of different orders . our procedure incorporates time-varying explanatory variables and unobservables . we present conditions that justify conventional formulae relating hazards to survivor functions when time-varying variables enter hazards . we also consider the validity of widely-used piecemeal estimation strategies that focus on one birth at a time . we consider methods for selecting a best model among a class of non-nested models . two criteria are set forth and used to evaluate the determinants of third births in sweden . '' ''
C0184661
procedur
C0220825
evaluat