全文获取类型
收费全文 | 20288篇 |
免费 | 629篇 |
国内免费 | 1篇 |
专业分类
管理学 | 2683篇 |
民族学 | 120篇 |
人才学 | 1篇 |
人口学 | 1802篇 |
丛书文集 | 77篇 |
教育普及 | 1篇 |
理论方法论 | 1806篇 |
综合类 | 187篇 |
社会学 | 10320篇 |
统计学 | 3921篇 |
出版年
2023年 | 147篇 |
2022年 | 85篇 |
2021年 | 139篇 |
2020年 | 377篇 |
2019年 | 536篇 |
2018年 | 660篇 |
2017年 | 858篇 |
2016年 | 651篇 |
2015年 | 434篇 |
2014年 | 605篇 |
2013年 | 3673篇 |
2012年 | 824篇 |
2011年 | 711篇 |
2010年 | 522篇 |
2009年 | 431篇 |
2008年 | 554篇 |
2007年 | 506篇 |
2006年 | 554篇 |
2005年 | 420篇 |
2004年 | 431篇 |
2003年 | 367篇 |
2002年 | 373篇 |
2001年 | 474篇 |
2000年 | 416篇 |
1999年 | 405篇 |
1998年 | 314篇 |
1997年 | 267篇 |
1996年 | 281篇 |
1995年 | 290篇 |
1994年 | 250篇 |
1993年 | 259篇 |
1992年 | 301篇 |
1991年 | 295篇 |
1990年 | 289篇 |
1989年 | 255篇 |
1988年 | 238篇 |
1987年 | 202篇 |
1986年 | 229篇 |
1985年 | 251篇 |
1984年 | 216篇 |
1983年 | 193篇 |
1982年 | 160篇 |
1981年 | 132篇 |
1980年 | 156篇 |
1979年 | 170篇 |
1978年 | 134篇 |
1977年 | 115篇 |
1976年 | 88篇 |
1975年 | 93篇 |
1974年 | 95篇 |
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
981.
Bráulio M. Veloso Thais R. Correa Marcos O. Prates Gabriel F. Oliveira Andréa I. Tavares 《Statistics and Computing》2017,27(4):1099-1110
Crime or disease surveillance commonly rely in space-time clustering methods to identify emerging patterns. The goal is to detect spatial-temporal clusters as soon as possible after its occurrence and to control the rate of false alarms. With this in mind, a spatio-temporal multiple cluster detection method was developed as an extension of a previous proposal based on a spatial version of the Shiryaev–Roberts statistic. Besides the capability of multiple cluster detection, the method have less input parameter than the previous proposal making its use more intuitive to practitioners. To evaluate the new methodology a simulation study is performed in several scenarios and enlighten many advantages of the proposed method. Finally, we present a case study to a crime data-set in Belo Horizonte, Brazil. 相似文献
982.
983.
In this paper we provide three nonparametric tests of independence between continuous random variables based on the Bernstein copula distribution function and the Bernstein copula density function. The first test is constructed based on a Cramér-von Mises divergence-type functional based on the empirical Bernstein copula process. The two other tests are based on the Bernstein copula density and use Cramér-von Mises and Kullback–Leibler divergence-type functionals, respectively. Furthermore, we study the asymptotic null distribution of each of these test statistics. Finally, we consider a Monte Carlo experiment to investigate the performance of our tests. In particular we examine their size and power which we compare with those of the classical nonparametric tests that are based on the empirical distribution function. 相似文献
984.
Insha Ullah Matthew D.M. Pawley Adam N.H. Smith Beatrix Jones 《Australian & New Zealand Journal of Statistics》2017,59(4):449-462
Multivariate control charts are used to monitor stochastic processes for changes and unusual observations. Hotelling's T2 statistic is calculated for each new observation and an out‐of‐control signal is issued if it goes beyond the control limits. However, this classical approach becomes unreliable as the number of variables p approaches the number of observations n, and impossible when p exceeds n. In this paper, we devise an improvement to the monitoring procedure in high‐dimensional settings. We regularise the covariance matrix to estimate the baseline parameter and incorporate a leave‐one‐out re‐sampling approach to estimate the empirical distribution of future observations. An extensive simulation study demonstrates that the new method outperforms the classical Hotelling T2 approach in power, and maintains appropriate false positive rates. We demonstrate the utility of the method using a set of quality control samples collected to monitor a gas chromatography–mass spectrometry apparatus over a period of 67 days. 相似文献
985.
A powerful and efficient algorithm for breaking the links between aliased effects in asymmetric designs 下载免费PDF全文
A. M. Elsawah 《Australian & New Zealand Journal of Statistics》2017,59(1):17-41
Fractional factorial (FF) designs are no doubt the most widely used designs in experimental investigations due to their efficient use of experimental runs. One price we pay for using FF designs is, clearly, our inability to obtain estimates of some important effects (main effects or second order interactions) that are separate from estimates of other effects (usually higher order interactions). When the estimate of an effect also includes the influence of one or more other effects the effects are said to be aliased. Folding over an FF design is a method for breaking the links between aliased effects in a design. The question is, how do we define the foldover structure for asymmetric FF designs, whether regular or nonregular? How do we choose the optimal foldover plan? How do we use optimal foldover plans to construct combined designs which have better capability of estimating lower order effects? The main objective of the present paper is to provide answers to these questions. Using the new results in this paper as benchmarks, we can implement a powerful and efficient algorithm for finding optimal foldover plans which can be used to break links between aliased effects. 相似文献
986.
Elisa Perrone Andreas Rappold Werner G. Müller 《Statistical Methods and Applications》2017,26(3):403-418
Optimum experimental design theory has recently been extended for parameter estimation in copula models. The use of these models allows one to gain in flexibility by considering the model parameter set split into marginal and dependence parameters. However, this separation also leads to the natural issue of estimating only a subset of all model parameters. In this work, we treat this problem with the application of the \(D_s\)-optimality to copula models. First, we provide an extension of the corresponding equivalence theory. Then, we analyze a wide range of flexible copula models to highlight the usefulness of \(D_s\)-optimality in many possible scenarios. Finally, we discuss how the usage of the introduced design criterion also relates to the more general issue of copula selection and optimal design for model discrimination. 相似文献
987.
988.
Keva M. Miller J. Mark Eddy Sharon Borja Sarah R. Lazzari 《Smith College studies in social work》2017,87(1):59-77
ABSTRACTIncarcerated parents have complex life histories that often remain unresolved during incarceration, can continue to create barriers to prosocial success on release, and present similar intergenerational challenges for their children. This study examines the life histories of incarcerated fathers and mothers from the Pacific Northwest and how their experiences vary based on race and ethnicity. Five areas examined were exposure to trauma, child welfare involvement, mental health and substance abuse problems, juvenile justice and adult criminal justice involvement, and intergenerational criminal justice involvement. The sample comprised 359 incarcerated parents, and their racial/ethnic composition was 59% White, 14% African American, 11% multiracial, 8% Native American, and 7% Latino. Few differences were found across racial and ethnic groups. Mothers appeared more similar to each other across groups than fathers. Results illustrated similarities yet some surprising differences with national trends on key study variables. Implications for future research and intervention and prevention are discussed. 相似文献
989.
ABSTRACTThe Washington State Legislature created the Parenting Sentencing Alternative in 2010, authorizing a substitute to total confinement for parents of minor children. The Alternative is designed to strengthen family bonds and improve parenting skills to encourage successful reintegration. An overview of the Alternative’s history, design, and implementation is presented, followed by preliminary results from an impact evaluation. A case study of a successful participant is presented, and implications for the findings are discussed. 相似文献
990.