全文获取类型
收费全文 | 1573篇 |
免费 | 37篇 |
国内免费 | 3篇 |
专业分类
管理学 | 63篇 |
民族学 | 1篇 |
人口学 | 17篇 |
丛书文集 | 23篇 |
理论方法论 | 16篇 |
综合类 | 212篇 |
社会学 | 25篇 |
统计学 | 1256篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 13篇 |
2020年 | 20篇 |
2019年 | 48篇 |
2018年 | 67篇 |
2017年 | 138篇 |
2016年 | 40篇 |
2015年 | 48篇 |
2014年 | 55篇 |
2013年 | 452篇 |
2012年 | 97篇 |
2011年 | 72篇 |
2010年 | 50篇 |
2009年 | 51篇 |
2008年 | 59篇 |
2007年 | 52篇 |
2006年 | 45篇 |
2005年 | 47篇 |
2004年 | 34篇 |
2003年 | 35篇 |
2002年 | 19篇 |
2001年 | 27篇 |
2000年 | 19篇 |
1999年 | 16篇 |
1998年 | 21篇 |
1997年 | 15篇 |
1996年 | 8篇 |
1995年 | 8篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 2篇 |
1991年 | 7篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有1613条查询结果,搜索用时 15 毫秒
891.
Giuseppe Ragusa 《Econometric Reviews》2013,32(4):406-456
This article studies the minimum divergence (MD) class of estimators for econometric models specified through moment restrictions. We show that MD estimators can be obtained as solutions to a tractable lower dimensional optimization problem. This problem is similar to the one solved by the generalized empirical likelihood estimators of Newey and Smith (2004), but it is equivalent to it only for a subclass of divergences. The MD framework provides a coherent testing theory: tests for overidentification and parametric restrictions in this framework can be interpreted as semiparametric versions of Pearson-type goodness of fit tests. The higher order properties of MD estimators are also studied and it is shown that MD estimators that have the same higher order bias as the empirical likelihood (EL) estimator also share the same higher order mean square error and are all higher order efficient. We identify members of the MD class that are not only higher order efficient, but also, unlike the EL estimator, well behaved when the moment restrictions are misspecified. 相似文献
892.
本研究的目的在于对成人依恋类型与社交焦虑障碍的关系进行深入探讨,为建立SAD的成人依恋心理表征模型提供依据。结果表明:成人依恋先占类型对社交焦虑障碍发生的影响作用是正常组的4.48倍,而拒绝类型对社交焦虑障碍发生的影响作用是正常组的4.76倍,恐惧类型对社交焦虑障碍发生的影响作用是正常组的66.67倍。成人依恋类型是SAD发病的核心因素,就像一个桥梁,其他因子是围绕着成人依恋不同的类型表现而起着不同的影响。 相似文献
893.
《Journal of Statistical Computation and Simulation》2012,82(10):841-852
The two-parameter generalized exponential (GE) distribution was introduced by Gupta and Kundu [Gupta, R.D. and Kundu, D., 1999, Generalized exponential distribution. Australian and New Zealand Journal of Statistics, 41(2), 173–188.]. It was observed that the GE can be used in situations where a skewed distribution for a nonnegative random variable is needed. In this article, the Bayesian estimation and prediction for the GE distribution, using informative priors, have been considered. Importance sampling is used to estimate the parameters, as well as the reliability function, and the Gibbs and Metropolis samplers data sets are used to predict the behavior of further observations from the distribution. Two data sets are used to illustrate the Bayesian procedure. 相似文献
894.
《Journal of Statistical Computation and Simulation》2012,82(18):3544-3564
ABSTRACTSiZer (significant zero crossings of derivatives) is an effective tool for exploring significant features in curves from the viewpoint of the scale space theory. In this paper, a SiZer approach is developed for generalized varying coefficient models (GVCMs) in order to achieve the task of understanding dynamic characteristics of the regression relationship at multiscales. The proposed SiZer method is based on the local-linear maximum likelihood estimation of GVCMs and the one-step estimation procedure is employed to alleviate the computational cost of estimating the coefficients and their derivatives at different scales. Simulation studies are performed to assess the performance of the SiZer inference and two real-world examples are given to demonstrate its applications. 相似文献
895.
《Journal of Statistical Computation and Simulation》2012,82(1-3):231-253
Modeling clustered categorical data based on extensions of generalized linear model theory has received much attention in recent years. The rapidly increasing number of approaches suitable for categorical data in which clusters are uncorrelated, but correlations exist within a cluster, has caused uncertainty among applied scientists as to their respective merits and demerits. Upon centering estimation around solving an unbiased estimating function for mean parameters and estimation of covariance parameters describing within-cluster or among-cluster heterogeneity, many approaches can easily be related. This contribution describes a series of algorithms and their implementation in detail, based on a classification of inferential procedures for clustered data. 相似文献
896.
《统计学通讯:理论与方法》2012,41(24):5943-5952
AbstractThe generalized variance is an important statistical indicator which appears in a number of statistical topics. It is a successful measure for multivariate data concentration. In this article, we established, in a closed form, the bias of the generalized variance maximum likelihood estimator of the Multinomial family. We also derived, with a complete proof, the uniformly minimum variance unbiased estimator (UMVU) for the generalized variance of this family. These results rely on explicit calculations, the completeness of the exponential family and the Lehmann–Scheffé theorem. 相似文献
897.
The signature-based mixture representations for coherent systems are a good way to obtain distribution-free comparisons of systems. Unfortunately, these representations only hold for systems whose component lifetimes are independent and identically distributed (IID) or exchangeable (i.e., their joint distribution is invariant under permutations). In this paper we obtain comparison results for generalized mixtures, that is, for reliability functions that can be written as linear combinations of some baseline reliability functions with positive and negative coefficients. These results are based on some concepts in Graph Theory. We apply these results to obtain new comparison results for coherent systems without the IID or exchangeability assumptions by using their generalized mixture representations based on the minimal path sets. 相似文献
898.
This paper investigates estimation of parameters in a combination of the multivariate linear model and growth curve model, called a generalized GMANOVA model. Making analogy between the outer product of data vectors and covariance yields an approach to directly do least squares to covariance. An outer product least squares estimator of covariance (COPLS estimator) is obtained and its distribution is presented if a normal assumption is imposed on the error matrix. Based on the COPLS estimator, two-stage generalized least squares estimators of the regression coefficients are derived. In addition, asymptotic normalities of these estimators are investigated. Simulation studies have shown that the COPLS estimator and two-stage GLS estimators are alternative competitors with more efficiency in the sense of sample mean, standard deviations and mean of the variance estimates to the existing ML estimator in finite samples. An example of application is also illustrated. 相似文献
899.
中国农产品价格波动特征的实证研究——基于广义误差分布的ARCH类模型 总被引:1,自引:0,他引:1
近年来农产品价格波动频繁,结构特征明显,主要是因为受到生猪、棉花、大豆、胶脂果实类林产品和稻谷等农作物价格波动的影响.利用广义误差分布的ARCH类模型对主要农产品价格波动特征进行分析,结果表明:棉花价格没有显著的异方差效应;生猪、大豆和稻谷的价格波动具有显著的集聚性,但其市场并没有表现出高风险高回报的特征;稻谷价格波动具有显著的非对称性,但大豆和生猪的价格波动没有显著的非对称性.基于GED的ARCH类模型提高了模型的拟合效果,可以更好地分析中国主要农产品价格波动特征. 相似文献
900.
Hani Samawi Jingxian Cai Daniel F. Linder Haresh Rochani Jingjing Yin 《Journal of Statistical Computation and Simulation》2018,88(6):1211-1227
Mediation is a hypothesized causal chain among three variables. Mediation analysis for continuous response variables is well developed in the literature, and it can be shown that the indirect effect is equal to the total effect minus the direct effect. However, mediation analysis for categorical responses is still not fully developed. The purpose of this article is to propose a simpler method of analysing the mediation effect among three variables when the dependent and mediator variables are both dichotomous. We propose using the latent variable technique which in turn will adjust for the necessary condition that indirect effect is equal to the total effect minus the direct effect. An intensive simulation study is conducted to compare the proposed method with other methods in the literature. Our theoretical derivation and simulation study show that the proposed approach is simpler to use and at least as good as other approaches provided in the literature. We illustrate our approach to test for the potential mediators on the relationship between depression and obesity among children and adolescents compared to the method in Winship and Mare using National children health survey data 2011–2012. 相似文献