In this study, the author uses 25 years of data taken from the 1979 National Longitudinal Study of Youth to examine the relationship between family life course statuses and transitions and work-related health limitations. The author uses a detailed set of statuses and transitions that include marriage, divorce, cohabitation, and parenthood. The measures of health used tap health limitations in ...

Are CEOs’ attitudes and beliefs linked to their firms’ innovative performance? This paper uses Malmendier and Tate’s measure of overconfidence, based on CEO stockoption exercise, to study the relationship between a CEO’s “revealed beliefs” about future performance and standard measures of corporate innovation. We begin by developing a career concern model where CEOs innovate to provide evidence...

This paper builds a framework for analyzing models with multiple time-varying treatments when selection into treatment is sequential and varies across treatment statuses. The key challenge is to separate the time-varying effect of treatment from dynamic selection into treatment based on unobservables. To address this problem, we develop a method that is a hybrid between a control function and a...

This paper presents unique evidence that orphanhood matters in the long-run for health and education outcomes, in a region of Northwestern Tanzania. We study a sample of 718 nonorphaned children surveyed in 1991-94, who were traced and reinterviewed as adults in 2004. A large proportion, 19 percent, lost one or more parents before the age of 15 in this period, allowing us to assess permanent he...

We reexamine the effective action for the d-dimensional random field Ising model derived by Brézin and De Dominicis. We find a non-Gaussian fixed point where the φ4 couplings in the action have various scaling dimensions. The correlation-length exponent in d = 6 − ǫ has the value consistent with the argument of the dimensional reduction in the leading order.

Although each statistical unit on which measurements are taken is unique typically there is not enough information available to account totally for its uniqueness. Therefore heterogeneity among units has to be limited by structural assumptions. One classical approach is to use random effects models, which assume that heterogeneity can be described by distributional assumptions. However, inferen...

abstract this study uses gravity model to examine the most important determinants of was agricultural trade. to this aim, import and export statistics of iran agricultural products for the period 1380 to 1387 was provided from iran customs organization and other information was obtained from different internet bases. random effects estimating and hausman test ratio result in fixed effects model...

Meta-analysis is a standard statistical method used to combine the conclusions of individual studies that are related and the results of single study alone can not answered to deal with issues. The data are summarized by one or more outcome measure estimates along with their standard errors. The multivariate model and the variations between studies are not considered in most articles. Here we d...

This paper sheds some light on the problems associated with random effects gravity approaches. Arguments for the superiority of a fixed effects model are given both along intuitive and econometric lines based on a Hausman test.  2000 Elsevier Science S.A. All rights reserved.