全文获取类型
收费全文 | 7558篇 |
免费 | 183篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1063篇 |
民族学 | 45篇 |
人口学 | 645篇 |
丛书文集 | 22篇 |
理论方法论 | 634篇 |
综合类 | 70篇 |
社会学 | 3228篇 |
统计学 | 2035篇 |
出版年
2023年 | 44篇 |
2021年 | 49篇 |
2020年 | 108篇 |
2019年 | 176篇 |
2018年 | 190篇 |
2017年 | 277篇 |
2016年 | 197篇 |
2015年 | 128篇 |
2014年 | 200篇 |
2013年 | 1442篇 |
2012年 | 226篇 |
2011年 | 231篇 |
2010年 | 174篇 |
2009年 | 182篇 |
2008年 | 194篇 |
2007年 | 178篇 |
2006年 | 192篇 |
2005年 | 178篇 |
2004年 | 151篇 |
2003年 | 135篇 |
2002年 | 164篇 |
2001年 | 200篇 |
2000年 | 199篇 |
1999年 | 183篇 |
1998年 | 137篇 |
1997年 | 123篇 |
1996年 | 104篇 |
1995年 | 93篇 |
1994年 | 137篇 |
1993年 | 97篇 |
1992年 | 124篇 |
1991年 | 128篇 |
1990年 | 115篇 |
1989年 | 102篇 |
1988年 | 90篇 |
1987年 | 90篇 |
1986年 | 90篇 |
1985年 | 87篇 |
1984年 | 91篇 |
1983年 | 69篇 |
1982年 | 70篇 |
1981年 | 49篇 |
1980年 | 60篇 |
1979年 | 63篇 |
1978年 | 48篇 |
1977年 | 48篇 |
1976年 | 38篇 |
1975年 | 47篇 |
1974年 | 40篇 |
1971年 | 25篇 |
排序方式: 共有7742条查询结果,搜索用时 390 毫秒
461.
In a series of papers, Kshirsagar (1964, 1971) and McHenry and Kshirsagar (1977), factorize Wilks' A into a number of factors and find the independent null multivariate beta densities of these factors. These factors are the likelihood ratio test criteria for testing the goodness of fit of certain assigned discriminant functions or canonical variables either in the space of independent or dependent variables. Essentially the factors of Wilks' A are the factors of certain multivariate beta distributed matrix or its determinant. The Bartlett decomposition of the underlying multivariate beta distribution into independent factors determines the distribution of these factors. The present paper generalizes Kshirsagar's (1971) normal theory to the elliptically contoured model, and shows that his results are null robust for the elliptically contoured model. 相似文献
462.
Lot resubmissions are allowed in situations where the original inspection results are suspected or when the supplier is allowed to opt for resampling as per the provisions of the contract etc. This paper examines the situation of resampling of lots and derives the performance measures of a resampling scheme having a single sampling plan for inspection. The usefulness and limitations of resampling of resubmitted lots are also discussed 相似文献
463.
K.S. Madhava Rao 《统计学通讯:理论与方法》2013,42(12):4559-4568
Nonparametric test statistics are constructed by considering the medians in subsamples of appropriate size taken -from n independent observations. These tests are shown to be sensitive to both heavy and moderate tailed distributions. 相似文献
464.
W.G.Cochran: Sampling Techniques, 3rd. Ed. John Wiley & Sons, New York-Santa Barbara-London-Sydney-Toronto 1977. 428 S., £ 12.50; $21.50. H.Toutenburg: Vorhersage in linearen Modellen. Akademie-Verlag, Berlin 1975, VIII, 176b S., 3 Tab., 28,– M. O.Kallenberg: Random Measure. Akademie-Verlag, Berlin 1975; Academic Press, London 1976. 104 pp., 28,– M. 相似文献
465.
Optimality of experimental designs for spatially correlated observations is investigated.come two dimensional correlation structures are discussed and an attempt has been made to find optimal or nearly optimal design for each sitution.The solution lend to designs similar to that used for repeated measurements.The relative efficiency of the proposed designs in comparison to randomized latin square designs is tabulated for some cases. 相似文献
466.
When using data envelopment analysis (DEA) as a benchmarking technique for nursing homes, it is essential to include measures of the quality of care. We survey applications where quality has been incorporated into DEA models and consider the concerns that arise when the results show that quality measures have been effectively ignored. Three modeling techniques are identified that address these concerns. Each of these techniques requires some input from management as to the proper emphasis to be placed on the quality aspect of performance. We report the results of a case study in which we apply these techniques to a DEA model of nursing home performance. We examine in depth not only the resulting efficiency scores, but also the benchmark sets and the weights given to the input and output measures. We find that two of the techniques are effective in insuring that DEA results discriminate between high and low quality performance. 相似文献
467.
An algorithm is presented for computing the finite population parameters and the approximate probability values associated with a recently-developed class of statistical inference techniques termed multi-response randomized block permutation procedures (MRBP). 相似文献
468.
In this paper, Fisher information matrix about the five parameters ρ, μ:1, μ2, λ1and λ2of a mixture of two Inverse Gaussian density functions is obtained. The Leguerre-Gauss quadrature formula is used to evaluate the essential integral on which the twenty five elements of the information matrix are based. Results involving the computation of the information about p are compared with those involving both the power series expansion and Simpson's method of integration. Laguerre-Gauss quadra-ture was found to lead to good approximations as compared with other methods. It was therefore chosen for the computations of the elements of the information matrix. 相似文献
469.
William J. Hall Kristen D. Witkemper Grayson K. Rodgers Emily M. Waters Mark R. Smith 《Journal of gay & lesbian social services》2018,30(1):49-63
Purpose: Many students who are lesbian, gay, bisexual, transgender, or queer (LGBTQ) face hostile school environments that can negatively impact their mental health and education. This study involved a photovoice project where high school students from a gay-straight alliance in the rural southeastern United States took photographs that depicted the issues LGBTQ students were facing and then exhibited their photographs and stories to individuals from the school system and local community to promote awareness, dialogue, and action. Methods: Twenty adults who attended the photovoice exhibit responded to an online survey about their experiences with the intervention. Results: Eighty-five percent of adults reported that the intervention made them think about issues they had not previously considered, including the struggles LGBTQ youths face, gender issues, and living in a rural community. Common emotions experienced at the intervention included feeling excited, concern for the youths, and proud of the youths. Furthermore, 81% of the adults indicated that they would take action or behave differently as a result of the intervention, including supporting and affirming LGBTQ students, using gender-neutral and -inclusive language, and confronting bias in themselves and others. Conclusions: Photovoice is a promising strategy for LGBTQ students to activate adult allies in their community. 相似文献
470.
Sebastian Königs 《International Journal of Social Welfare》2018,27(2):146-156
This study investigated the monthly dynamics of social assistance benefit receipt – in particular the incidence of long‐term benefit receipt – in four European countries: Luxembourg, The Netherlands, Norway and Sweden. The analysis is based on four separate administrative panel data sets, each covering the 96‐month period from January 2001 to December 2008. Benefit dynamics were found to vary considerably across countries. In the two Nordic countries, long‐term benefit receipt was found to be a rare exception. Most recipients, however, had multiple spells and the majority of benefit leavers returned to benefits within a few months of leaving. In Luxembourg and The Netherlands, long‐term benefit receipt was frequent, but benefit leavers were much less likely to return to benefit receipt after exit. The total duration of benefit receipt per individual across spells was two to three times as high in The Netherlands and Luxembourg as in Norway and Sweden. 相似文献