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81.
Although work experience has been widely recommended as beneficial to adolescent development, there is little empirical support for this recommendation. The Youth Conservation Corps (YCC), combining as it does some of the best features of both paid work and unpaid community service, offers an opportunity to explore the developmental impact of work experience. However, the need to pay as much attention to the problems of measurement as to the programs themselves dictates simultaneous evaluation of both programs and measures.  相似文献   
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The authors derive the joint distributions of a studentized deleted residual and various regression quantities, calculated with all the data or with one case deleted. They show that the correlation between the studentized deleted residual and the deleted test statistic has an interesting interpretation in terms of well‐known regression quantities. These results allow them to examine the effect of applying some naive outlier deletion methods before making inferences about a regression parameter.  相似文献   
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Dropouts are frequent in mental health care. Several client factors have been identified as dropout predictors, including ethnic minority status, race, low SES, and more severe symptoms. Research on therapist and process variables is less common, and findings are inconsistent. This study used administrative data for 434,317 patients from CIGNA Behavioral Health (CIGNA) to examine dropout rates by profession of provider, therapy modality, and DSM-IV diagnosis. Results indicate that among the providers, MFTs have the lowest dropout rates in the CIGNA network. Of the therapy modalities, individual therapy is associated with lower dropout rates than family therapy. Mood and anxiety disorders have lower dropout rates than other diagnosis categories, while schizophrenia, psychotic, and substance use disorders have the highest dropout rates.  相似文献   
86.
Classical organizational theory assumes a hierarchical structure and the vertical co‐ordination of work. Horizontal co‐ordination between organizational participants is currently recognized only at upper and middle organizational levels. This qualitative study of workers at the lowest rungs of the organizational hierarchy finds that they do engage in horizontal co‐ordination by working together in ways that are invisible. This study also finds differences between same‐sex work groups in how they perceive working together. The caring/sharing phenomenon describes the sharing of work, and the implementation of horizontal co‐ordination, undertaken in the context of caring relationships among work colleagues, all of whom were women. Women and men working in same‐sex work groups differ in their conceptions of how those work groups form and how they function. The findings from this study indicate that common conceptions of teams and teamwork may in fact be male norms of horizontal co‐ordination.  相似文献   
87.
Hamilton CH 《Demography》1966,3(2):393-415
This paper traces the history of the use of vital statistics, survival rates, and ratios in the estimation of net migration from one decade to another. Net migration studies by Hart (1921); Baker (1933) ; Hamilton (1934); Thornthwaite (1934); Lively and Taeuber (1939) ; Henderson (1943); Hamilton and Henderson (1943); Hamilton (1951); Siegel and Hamilton (1952); Lee and Bowles (1954); Price (1955); Lee, Miller, and others (1957); Hamilton (1959); Zachariah (1962); Tarver (1962); Shryock (1964); Eldridge (1965); Hamilton (1965); and the United States Census Bureau are cited as the principal users of various residual methods of estimating net migration. All these demographers have either implicitly or explicitly recognized that errors in census enumeration and in the registration of births and deaths have been reflected in errors of estimated net migration.The underlying characteristic of all the methods used by these demographers has been the estimation of net migration as a residual obtained by subtracting natural increase in an area during a decade from the population change during the same decade. This method has been most generally stated in the classic formula {fx394-1} This formula has been used both with total populations and with aging cohorts. The principal variations of the basic formula have involved the use of life table and census survival ratios as a means of measuring natural increase (B - D), or of estimating "expected" populations assuming no migration. The main points of controversy have involved life table v. censm survival ratios, assumptions regarding the similarity in national and state census enumeration errors, and ways and means of estimating the errors involved in estimates of migration and of migration rates by the various methods.Daniel O. Price (1955) and Zachariah (1962) made important mathematical contributions and attempted to evaluate the errors involved in the me of census survival rates. Eldridge (1965) discovered that, in the United States between 1950 and 1960, the use of the census survival rate method usually gave much lower estimates of net migration than did the classic vital statistic method. Hamilton (1965), using some suggestions by Hope T. Eldridge, developed a mathematical theory or explanation of not only why the CSR estimates were usually lower than the VS estimates but also why the CSR estimates would usually give closer estimates on the true net migration than would the EVS method, which itself is subject to errors of census enumeration and of underregistration of births and deaths. The author also discusses the effect of improvement in census enumeration between 1950 and 1960 on estimates of net migration and derives a generalized formula which takes the timing of migration into consideration.The author acknowledges with sincere appreciation important constructive suggestions made by Dr. Hope T. Eldridge, Population Studies Center, University of Pennsylvania, and the authors of the many papers used as original material. This paper is a revision of a paper read before the annual meeting ot the Population Association of America, Hotel Roosevelt, New York, New York, April 29-30, 1966. Contribution from the Departments of Sociology and Experimental Statistics, North Carolina Agricultural Experiment Station, North Carolina State University. Published with the approval of the Director of Research as Paper No. 2227 of the Journal series.  相似文献   
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Population Research and Policy Review - Restrictive US immigration laws and law enforcement undermine immigrant health by generating fear and stress, disrupting families and communities, and...  相似文献   
90.
This article shares information about an exciting new approach in psychiatry. During the past 12 years, the authors have worked with young people experiencing their first episode of psychosis. It is clear that intervention at the earliest stages of psychotic illness allows clinicians to make a significant difference in the lives of young people and their families. This article summarizes current intervention strategies, which are considered best practice guidelines for early treatment.  相似文献   
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