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51.
An Estimator for Some Binary-Outcome Selection Models Without Exclusion Restrictions 总被引:2,自引:0,他引:2
This article provides a new maximum-likelihood estimator forselection models with dichotomous dependent variables when identicalfactors affect the selection equation and the equation of interest.Such situations arise naturally in game-theoretic models whereselection is typically nonrandom and identical explanatory variablesinfluence all decisions under investigation. When identicalexplanatory variables influence selection and a subsequent outcomeof interest, the commonly used Heckman-type estimators identifyfrom distributional assumptions about the residuals alone. Whenits own identifying assumption is reasonable, the new estimatorallows the researcher to avoid the painful choice between identifyingfrom distributional assumptions alone and adding a theoreticallyunjustified variable to the selection equation in a mistakenattempt to "boost" identification. The article uses Monte Carlomethods to compare the small-sample properties of the estimatorwith those of the Heckman-type estimator and ordinary probit. 相似文献
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Rogel MJ Zuehlke ME Petersen AC Tobin-richards M Shelton M 《Journal of youth and adolescence》1980,9(6):491-506
The contraceptive behavior of adolescent girls was viewed from a decision-making perspective. A semistructured interview protocol was used in interviewing 120 girls aged 12–19 in three clinics (Teen Family Planning, Prenatal, Pediatric Acute Care) at Michael Reese Hospital and Medical Center on (1) demographic in formation; (2) sexual and obstetric history; (3) contraceptive and sexual knowledge, attitudes, and practices; (4) environmental pressures; (5) personality factors; and (6) decision-making style. We found that the girls were generally poor contraceptors. They viewed the costs of contraception (in terms of safety) to be high; and they positively valued physical intimacy, opportunities for which come up unexpectedly and sporadically. These factors, along with their ambivalent views toward pregnancy and childbearing seemed to encourage their risk-taking behavior. Once pregnancy occurred, it was carried to term because of the strong internal and external pressures they felt to have and keep the baby. The peer-led intervention program that we are developing based on the survey findings will focus on (1) the teenagers' lack of accurate and complete knowledge about birth control and conception, (2) their limited sense of options concerning birth control and pregnancy outcomes, and (3) their poor understanding of and lack of insight into what motivates their behavior.This study is part of the investigation being conducted by the YADMAC (Young Adult and Adolescent Decision Making About Contraception) Project at Michael Reese Hospital and Medical Center, 2959 South Cottage Grove, Chicago, Illinois 60616. The authors are all members of the YADMAC research team.Received Ph.D. from the University of Chicago. Current interests are human sexuality and reproductive behavior. Currently at Department of Psychology, St. Xavier College.Received M.D. from the University of Michigan. Current interests are liaison child psychiatry and adolescent sexuality.Received Ph.D. from the University of Chicago. Current interests are early adolescent development issues.Current interests are puberty and sex differences.B. A. candidate in social work, Roosevelt University. Current interests are adolescent sexuality and contraceptive behavior. 相似文献
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The present study addressed the impact of an urban police force laying criminal charges in cases of wife abuse. Follow-up data from battered women and from police officers were collected to identify the long-term consequences of this police policy that began in 1981, including any negative or unintended side effects. Results indicated that the policy resulted in a dramatic increase in police-laid charges (2500%), and a shift from the Family to the Criminal Division of Provincial Court. Based on interview data, victims did not decrease their requests for police service (a feared side effect) and reported a significantly higher level of satisfaction with police service in this area. A significant reduction in police calls and victim-reported violence was associated with police intervention, especially when charges were laid. Paradoxically, police officers' attitudes about the policy were more negative than the actual positive changes that they helped to produce. Considerations for future research and professional training are outlined. 相似文献
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Anne Pollock 《The Journal of law, medicine & ethics》2008,36(3):530-536
In contrast to discussions of BiDil, this paper explores racial meaning-making processes around an old generic hypertension drug. By unpacking a vignette about race and thiazide outside marketing or medicine, it shows that racialization of drugs exceeds those spheres and moves in unpredictable ways. 相似文献
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