首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   182篇
  免费   3篇
管理学   6篇
民族学   3篇
人口学   7篇
丛书文集   2篇
理论方法论   18篇
综合类   36篇
社会学   61篇
统计学   52篇
  2023年   1篇
  2022年   1篇
  2021年   1篇
  2020年   5篇
  2018年   9篇
  2017年   6篇
  2016年   5篇
  2015年   7篇
  2014年   6篇
  2013年   35篇
  2012年   6篇
  2011年   11篇
  2010年   8篇
  2009年   12篇
  2008年   13篇
  2007年   8篇
  2006年   14篇
  2005年   5篇
  2004年   7篇
  2003年   5篇
  2002年   6篇
  2001年   4篇
  2000年   5篇
  1999年   1篇
  1998年   2篇
  1997年   1篇
  1981年   1篇
排序方式: 共有185条查询结果,搜索用时 15 毫秒
1.
Sample selection and attrition are inherent in a range of treatment evaluation problems such as the estimation of the returns to schooling or training. Conventional estimators tackling selection bias typically rely on restrictive functional form assumptions that are unlikely to hold in reality. This paper shows identification of average and quantile treatment effects in the presence of the double selection problem into (i) a selective subpopulation (e.g., working—selection on unobservables) and (ii) a binary treatment (e.g., training—selection on observables) based on weighting observations by the inverse of a nested propensity score that characterizes either selection probability. Weighting estimators based on parametric propensity score models are applied to female labor market data to estimate the returns to education.  相似文献   
2.
This paper develops a specification test for instrument validity in the heterogeneous treatment effect model with a binary treatment and a discrete instrument. The strongest testable implication for instrument validity is given by the condition for nonnegativity of point‐identifiable compliers' outcome densities. Our specification test infers this testable implication using a variance‐weighted Kolmogorov–Smirnov test statistic. The test can be applied to both discrete and continuous outcome cases, and an extension of the test to settings with conditioning covariates is provided.  相似文献   
3.
ABSTRACT

The aim of this study was to explore the effectiveness of Methadone Maintenance Treatment (MMT) from the perspective of drug users and their families. For this qualitative content analysis study, 15 participants were selected via purposive sampling. Data collection was done using deep and semi-structured interviews, which were then analyzed. The results showed that MMT can bring favorable impacts into the patients’ lives and help them with the process of treatment and rehabilitation despite the medical side effects.  相似文献   
4.
由于克隆人在总体上违背了生命伦理原则,科学家的主流意见是坚决反对的。世界卫生组织及各国政府都明确表示反对克隆人。如果生殖性克隆得到允许,它对人类社会的破坏将是毁灭性的。应订立一部禁止克隆人的单行刑事法;在禁止克隆人的立法中也要注意对其它合法的有关人体胚胎的克隆进行约束,防止其向克隆人的方向转化。  相似文献   
5.
针对我国20世纪80年代以来出生人口性别比持续升高现象分析认为,在我国,造成出生人口性别比升高的直接原因是非法胎儿性别鉴定的存在,深层次原因则是源于农村较低的经济发展水平和由此引起的社会保障制度不完善,以及国家在倡导男女平等的基本国策方面缺乏切实有效的政策措施。由此提出,建设社会主义新型生育文化、制定提高女性社会地位的相关政策、加强相关法规建设、完善社会保障制度以及借鉴他国成功经验等应是综合治理出生人口性别比升高的具体对策。  相似文献   
6.
Doubly adaptive biased coin design (DBCD) is an important family of response-adaptive randomization procedures for clinical trials. It uses sequentially updated estimation to skew the allocation probability to favor the treatment that has performed better thus far. An important assumption for the DBCD is the homogeneity assumption for the patient responses. However, this assumption may be violated in many sequential experiments. Here we prove the robustness of the DBCD against certain time trends in patient responses. Strong consistency and asymptotic normality of the design are obtained under some widely satisfied conditions. Also, we propose a general weighted likelihood method to reduce the bias caused by the heterogeneity in the inference after a trial. Some numerical studies are also presented to illustrate the finite sample properties of DBCD.  相似文献   
7.
Children living in foster care are an especially vulnerable population who often come to the attention of Medicaid mental health providers. These children experience a high incidence of emotional and behavioral disorders and may have specialized treatment needs related to their living arrangement status. This study assessed whether Children’s Psychosocial Rehabilitation could effectively treat youth with severe emotional and behavioral disorders who live in foster care. Analysis of data from an open trial of 218 clinically-impaired youth, aged 3–18 years, revealed no reliable differences in treatment outcome between foster versus non-foster children, with a trend toward more favorable outcomes for foster youth. Findings justify further study of the effectiveness of this Medicaid-funded service for the treatment of youth in care.  相似文献   
8.
ABSTRACT

Engagement of individuals with serious mental illnesses in community mental health services is a significant challenge. The Program of Assertive Community Treatment (PACT) is an individual-centered and self-contained mental health program that provides psychiatric treatment, rehabilitation, and support services to persons with serious mental illness who have a history of or likelihood of disengagement with services. Understanding what helps and hinders consumers’ involvement in PACT services may provide information on how to tailor engagement strategies to individuals based on their treatment needs and preferences. The current study builds on existing studies by exploring factors that help and hinder engagement in PACT services from the perspectives of individuals receiving treatment. We conducted open-ended, semi-structured interviews with 17 individuals receiving PACT services. Nine themes were identified through thematic analysis: Desirable qualities of PACT, Focusing on positive outcomes, PACT as a safety net, Recovery orientation, Practical barriers, Conflictual relationships, and Medication side-effects. We conclude that the development of a trusting, therapeutic relationship that is collaborative and person-centered and that is facilitated by both practical and emotional support is critical to engaging individuals in treatment and maximizing positive outcomes.  相似文献   
9.
Consider comparing between two treatments a response variable, whose expectation depends on the value of a continuous covariate in some nonlinear fashion. We fit separate segmented linear models to each treatment to approximate the nonlinear relationship. For this setting, we provide a simultaneous confidence band for the difference between treatments of the expected value functions. The treatments are said to differ significantly on intervals of the covariate where the simultaneous confidence band does not contain zero. We consider segmented linear models where the locations of the changepoints are both known and unknown. The band is obtained from asymptotic results.  相似文献   
10.
This paper reviews the work of Professor Selma Fraiberg who became a leading figure in the field of infant mental health. Born in 1918 she first received an MSW in Social Work and then undertook her Analytic Training in Detroit Michigan. While she maintained her identity as a social worker throughout her life, she integrated insights from the fields of social work, psychoanalysis and developmental and ego psychology in her research and practice. This paper traces her development as a clinician, researcher, and educator. Three cases describe her ability to integrate social work methodologies with analytic insights. The cases describe the treatment of a latency age child at a time of social change, a clinical research study of the developmental risk of children blind from birth, and a groundbreaking study in the field of infant mental health. Her study of infants at developmental risk focused on the parent /infant relationship and parents were included in the treatment process so that they could become more attuned to their young child. Her work highlighted the intergenerational issues that shaped the parental capacity for empathic nurturance between parent and child. The article Ghosts in the Nursery incorporated the major theoretical concepts of the new theoretical approach to treatment and is still much read in graduate programs today. Although extensive new research has added to the field of infant mental health, her contributions are still relevant to research and practice today.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号