全文获取类型
收费全文 | 2266篇 |
免费 | 48篇 |
专业分类
管理学 | 332篇 |
民族学 | 13篇 |
人才学 | 1篇 |
人口学 | 202篇 |
丛书文集 | 6篇 |
理论方法论 | 270篇 |
综合类 | 27篇 |
社会学 | 1154篇 |
统计学 | 309篇 |
出版年
2023年 | 20篇 |
2022年 | 10篇 |
2021年 | 21篇 |
2020年 | 40篇 |
2019年 | 63篇 |
2018年 | 53篇 |
2017年 | 86篇 |
2016年 | 86篇 |
2015年 | 61篇 |
2014年 | 55篇 |
2013年 | 312篇 |
2012年 | 107篇 |
2011年 | 94篇 |
2010年 | 70篇 |
2009年 | 75篇 |
2008年 | 74篇 |
2007年 | 95篇 |
2006年 | 82篇 |
2005年 | 73篇 |
2004年 | 73篇 |
2003年 | 66篇 |
2002年 | 57篇 |
2001年 | 60篇 |
2000年 | 48篇 |
1999年 | 51篇 |
1998年 | 34篇 |
1997年 | 19篇 |
1996年 | 33篇 |
1995年 | 24篇 |
1994年 | 27篇 |
1993年 | 17篇 |
1992年 | 32篇 |
1991年 | 21篇 |
1990年 | 21篇 |
1989年 | 21篇 |
1988年 | 16篇 |
1987年 | 12篇 |
1986年 | 21篇 |
1985年 | 19篇 |
1984年 | 15篇 |
1983年 | 19篇 |
1982年 | 18篇 |
1981年 | 10篇 |
1980年 | 13篇 |
1979年 | 20篇 |
1978年 | 13篇 |
1976年 | 8篇 |
1975年 | 8篇 |
1974年 | 8篇 |
1967年 | 4篇 |
排序方式: 共有2314条查询结果,搜索用时 0 毫秒
41.
42.
Martin E 《Demography》2007,44(2):427-440
This article draws on evidence from an exploratory survey of living situations to assess the validity of assumptions about residence and to offer methodological innovations to improve coverage of people with tenuous attachment to households. These innovations include more inclusive probes and questions used to compile the roster of household residents; a review of the places a person stayed the previous few months; and a Residential Attachment scale that measures strength of attachment to households. This scale shows that it takes more probing to list tenuously attached people than most surveys do, suggesting that tenuously attached people are likely to be omitted from the typical survey roster. The Residential Attachment scale is correlated with social and economic participation in households, suggesting that participation is fairly high even among those with tenuous or no residential attachment. 相似文献
43.
Researchers from a number of disciplines have offered competing theories about the effects oJ childbearing on parents 'postreproductive longevity. The "disposable soma theory" argues that investments in somatic maintenance increase longevity but reduce childbearing. "Maternal depletion" models suggest that the rigors of childrearing increase mortality in later years. Other researchers consider continued childbearing a sign of healthy aging and a predictor of future longevity. Empirical studies have produced inconsistent and contradictory results. Our focus is on the experience of widowhood, which has been ignored in previous studies. We hypothesize that the death of a spouse is a stressful event with long-term consequences for health, especially for women with small children. Data are drawn from historical sources in Sweden, Belgium, and the Netherlands from 1766 to 1980. Postreproductive mortality was highest among young widows with larger families in all three samples. Age at last birth had little or no effect. We conclude that raising children under adverse circumstances can have long-lasting, harmful effects on a mother's health. 相似文献
44.
45.
Making sense of census data: A components analysis of employment change among indigenous Australians 总被引:1,自引:0,他引:1
The 1996 Census count of indigenous Australians included a substantial number of individuals who were not recorded as indigenous
by the previous census. This paper considers the implications of this for interpreting change in employment numbers. Two adjustments
are made to employment change data. First, reverse survival of the 1996 population is applied to reconstruct 1991 employment
figures. Second, administrative data are used to discount employment generated by participation in labour market programs.
The effect is to substantially deflate the strong intercensal employment growth apparent from census counts with the conclusion
that the rate of indigenous employment in the mainstream labour market has fallen. 相似文献
46.
This article presents the results of an AIDS-sponsored investigation of teaching effectiveness in the decision sciences. Two national samples were employed in the study: a sample of 247 business school deans and a sample of 3,292 students from 32 different business schools. Included among the findings are that 87 percent of the deans responding indicate they require some sort of faculty teaching effectiveness evaluation, and that great care must be exercised when interpreting student ratings of an individual instructor's teaching effectiveness. 相似文献
47.
48.
A Note on the Large Sample Properties of Estimators Based on Generalized Linear Models for Correlated Pseudo‐observations 下载免费PDF全文
Pseudo‐values have proven very useful in censored data analysis in complex settings such as multi‐state models. It was originally suggested by Andersen et al., Biometrika, 90, 2003, 335 who also suggested to estimate standard errors using classical generalized estimating equation results. These results were studied more formally in Graw et al., Lifetime Data Anal., 15, 2009, 241 that derived some key results based on a second‐order von Mises expansion. However, results concerning large sample properties of estimates based on regression models for pseudo‐values still seem unclear. In this paper, we study these large sample properties in the simple setting of survival probabilities and show that the estimating function can be written as a U‐statistic of second order giving rise to an additional term that does not vanish asymptotically. We further show that previously advocated standard error estimates will typically be too large, although in many practical applications the difference will be of minor importance. We show how to estimate correctly the variability of the estimator. This is further studied in some simulation studies. 相似文献
49.
The nonparametric two-sample bootstrap is applied to computing uncertainties of measures in receiver operating characteristic (ROC) analysis on large datasets in areas such as biometrics, speaker recognition, etc. when the analytical method cannot be used. Its validation was studied by computing the standard errors of the area under ROC curve using the well-established analytical Mann–Whitney statistic method and also using the bootstrap. The analytical result is unique. The bootstrap results are expressed as a probability distribution due to its stochastic nature. The comparisons were carried out using relative errors and hypothesis testing. These match very well. This validation provides a sound foundation for such computations. 相似文献
50.
Very little is known about the local power of second generation panel unit root tests that are robust to cross-section dependence. This article derives the local asymptotic power functions of the cross-section argumented Dickey–Fuller Cross-section Augmented Dickey-Fuller (CADF) and CIPS tests of Pesaran (2007), which are among the most popular tests around. 相似文献