نتایج جستجو برای: duration dependence
تعداد نتایج: 358408 فیلتر نتایج به سال:
Lagged Duration Dependence in Mixed Proportional Hazard Models We study the non-parametric identification of a mixed proportional hazard model with lagged duration dependence when data provide multiple outcomes per individual or stratum. We show that the information conveyed by the within strata variation can be exploited to nonparametrically identify lagged duration dependence in more general ...
Introduction: To examine the effects of opium dependence and cigarette smoking on semen quality and sperm parameters, the semen quality of men who abuse opiates and/or smoke cigarettes was investigated in a retrospective study. Methods: Male partners of 1325 infertile couples attending the infertility clinic for intrauterine insemination (IUI) procedure were divided into non-smoking non-op...
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