全文获取类型
收费全文 | 2549篇 |
免费 | 63篇 |
国内免费 | 16篇 |
专业分类
管理学 | 164篇 |
劳动科学 | 1篇 |
民族学 | 2篇 |
人口学 | 31篇 |
丛书文集 | 49篇 |
理论方法论 | 21篇 |
综合类 | 617篇 |
社会学 | 74篇 |
统计学 | 1669篇 |
出版年
2024年 | 4篇 |
2023年 | 18篇 |
2022年 | 21篇 |
2021年 | 23篇 |
2020年 | 49篇 |
2019年 | 93篇 |
2018年 | 107篇 |
2017年 | 145篇 |
2016年 | 87篇 |
2015年 | 73篇 |
2014年 | 111篇 |
2013年 | 550篇 |
2012年 | 191篇 |
2011年 | 95篇 |
2010年 | 100篇 |
2009年 | 83篇 |
2008年 | 68篇 |
2007年 | 98篇 |
2006年 | 91篇 |
2005年 | 69篇 |
2004年 | 57篇 |
2003年 | 66篇 |
2002年 | 70篇 |
2001年 | 47篇 |
2000年 | 34篇 |
1999年 | 40篇 |
1998年 | 33篇 |
1997年 | 27篇 |
1996年 | 29篇 |
1995年 | 21篇 |
1994年 | 19篇 |
1993年 | 13篇 |
1992年 | 18篇 |
1991年 | 9篇 |
1990年 | 13篇 |
1989年 | 11篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 2篇 |
1983年 | 6篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1976年 | 1篇 |
排序方式: 共有2628条查询结果,搜索用时 15 毫秒
1.
2.
We study the asymptotic behavior of the marginal expected shortfall when the two random variables are asymptotic independent but positively associated, which is modeled by the so-called tail dependent coefficient. We construct an estimator of the marginal expected shortfall, which is shown to be asymptotically normal. The finite sample performance of the estimator is investigated in a small simulation study. The method is also applied to estimate the expected amount of rainfall at a weather station given that there is a once every 100 years rainfall at another weather station nearby. 相似文献
3.
4.
吴秀君 《江汉大学学报(社会科学版)》2002,19(1):22-25
本文研究了随机狄里克莱级数 在随机变量序列{Xn}独立(可不同分布)以及满足等条件时的增长性以及值分布,得到了一些新的结果. 相似文献
5.
Michael P. Fay Ji-Hyun Lee 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2006,169(1):81-96
Summary. We detail a general method for measuring agreement between two statistics. An application is two ratios of directly standardized rates which differ only by the choice of the standard. If the statistics have a high value for the coefficient of agreement then the expected squared difference between the statistics is small relative to the variance of the average of the two statistics, and inferences vary little by changing statistics. The estimation of a coefficient of agreement between two statistics is not straightforward because there is only one pair of observed values, each statistic calculated from the data. We introduce estimators of the coefficient of agreement for two statistics and discuss their use, especially as applied to functions of standardized rates. 相似文献
6.
Estimated associations between an outcome variable and misclassified covariates tend to be biased when the methods of estimation that ignore the classification error are applied. Available methods to account for misclassification often require the use of a validation sample (i.e. a gold standard). In practice, however, such a gold standard may be unavailable or impractical. We propose a Bayesian approach to adjust for misclassification in a binary covariate in the random effect logistic model when a gold standard is not available. This Markov Chain Monte Carlo (MCMC) approach uses two imperfect measures of a dichotomous exposure under the assumptions of conditional independence and non-differential misclassification. A simulated numerical example and a real clinical example are given to illustrate the proposed approach. Our results suggest that the estimated log odds of inpatient care and the corresponding standard deviation are much larger in our proposed method compared with the models ignoring misclassification. Ignoring misclassification produces downwardly biased estimates and underestimate uncertainty. 相似文献
7.
Pierre Legendre François-Joseph Lapointe 《Australian & New Zealand Journal of Statistics》2004,46(4):615-629
A test of congruence among distance matrices is described. It tests the hypothesis that several matrices, containing different types of variables about the same objects, are congruent with one another, so they can be used jointly in statistical analysis. Raw data tables are turned into similarity or distance matrices prior to testing; they can then be compared to data that naturally come in the form of distance matrices. The proposed test can be seen as a generalization of the Mantel test of matrix correspondence to any number of distance matrices. This paper shows that the new test has the correct rate of Type I error and good power. Power increases as the number of objects and the number of congruent data matrices increase; power is higher when the total number of matrices in the study is smaller. To illustrate the method, the proposed test is used to test the hypothesis that matrices representing different types of organoleptic variables (colour, nose, body, palate and finish) in single‐malt Scotch whiskies are congruent. 相似文献
8.
Backfitting Random Varying-Coefficient Models with Time-Dependent Smoothing Covariates 总被引:1,自引:0,他引:1
Abstract. In this paper, we propose a random varying-coefficient model for longitudinal data. This model is different from the standard varying-coefficient model in the sense that the time-varying coefficients are assumed to be subject-specific, and can be considered as realizations of stochastic processes. This modelling strategy allows us to employ powerful mixed-effects modelling techniques to efficiently incorporate the within-subject and between-subject variations in the estimators of time-varying coefficients. Thus, the subject-specific feature of longitudinal data is effectively considered in the proposed model. A backfitting algorithm is proposed to estimate the coefficient functions. Simulation studies show that the proposed estimation methods are more efficient in finite-sample performance compared with the standard local least squares method. An application to an AIDS clinical study is presented to illustrate the proposed methodologies. 相似文献
9.
10.