全文获取类型
收费全文 | 6442篇 |
免费 | 158篇 |
国内免费 | 3篇 |
专业分类
管理学 | 1001篇 |
民族学 | 56篇 |
人才学 | 9篇 |
人口学 | 503篇 |
丛书文集 | 47篇 |
理论方法论 | 777篇 |
综合类 | 51篇 |
社会学 | 3350篇 |
统计学 | 809篇 |
出版年
2023年 | 38篇 |
2022年 | 29篇 |
2021年 | 48篇 |
2020年 | 117篇 |
2019年 | 168篇 |
2018年 | 201篇 |
2017年 | 203篇 |
2016年 | 205篇 |
2015年 | 150篇 |
2014年 | 166篇 |
2013年 | 1004篇 |
2012年 | 226篇 |
2011年 | 251篇 |
2010年 | 194篇 |
2009年 | 162篇 |
2008年 | 195篇 |
2007年 | 221篇 |
2006年 | 200篇 |
2005年 | 231篇 |
2004年 | 198篇 |
2003年 | 174篇 |
2002年 | 169篇 |
2001年 | 118篇 |
2000年 | 154篇 |
1999年 | 123篇 |
1998年 | 111篇 |
1997年 | 104篇 |
1996年 | 95篇 |
1995年 | 84篇 |
1994年 | 109篇 |
1993年 | 90篇 |
1992年 | 98篇 |
1991年 | 65篇 |
1990年 | 56篇 |
1989年 | 56篇 |
1988年 | 68篇 |
1987年 | 52篇 |
1986年 | 47篇 |
1985年 | 56篇 |
1984年 | 67篇 |
1983年 | 55篇 |
1982年 | 58篇 |
1981年 | 50篇 |
1980年 | 53篇 |
1979年 | 44篇 |
1978年 | 33篇 |
1977年 | 31篇 |
1976年 | 46篇 |
1975年 | 26篇 |
1974年 | 35篇 |
排序方式: 共有6603条查询结果,搜索用时 15 毫秒
111.
112.
The empirical likelihood (EL) technique has been well addressed in both the theoretical and applied literature in the context of powerful nonparametric statistical methods for testing and interval estimations. A nonparametric version of Wilks theorem (Wilks, 1938) can usually provide an asymptotic evaluation of the Type I error of EL ratio-type tests. In this article, we examine the performance of this asymptotic result when the EL is based on finite samples that are from various distributions. In the context of the Type I error control, we show that the classical EL procedure and the Student's t-test have asymptotically a similar structure. Thus, we conclude that modifications of t-type tests can be adopted to improve the EL ratio test. We propose the application of the Chen (1995) t-test modification to the EL ratio test. We display that the Chen approach leads to a location change of observed data whereas the classical Bartlett method is known to be a scale correction of the data distribution. Finally, we modify the EL ratio test via both the Chen and Bartlett corrections. We support our argument with theoretical proofs as well as a Monte Carlo study. A real data example studies the proposed approach in practice. 相似文献
113.
While Markov chain Monte Carlo (MCMC) methods are frequently used for difficult calculations in a wide range of scientific disciplines, they suffer from a serious limitation: their samples are not independent and identically distributed. Consequently, estimates of expectations are biased if the initial value of the chain is not drawn from the target distribution. Regenerative simulation provides an elegant solution to this problem. In this article, we propose a simple regenerative MCMC algorithm to generate variates for any distribution. 相似文献
114.
In this article, four bivariate exponential (BVE) distributions with subject to right censoring samples are presented. Bayesian estimates of the parameters of BVE are obtained through Linex and quadratic loss functions. Gamma prior distribution has been suggested to reforming the posterior function. The estimations and standard errors of parameters have also been obtained through simulation method. Markov chain Monte Carlo (MCMC) method is employed for the case of Block-Buse bivariate distribution because there was no closed form for estimator criteria. Simulation studies have been conducted to show that the computation parts can be implemented easily and comparing the estimated values due to two methods and with the true values as well. 相似文献
115.
David F. Hendry 《Econometric Reviews》2013,32(1):65-70
In this paper we present a generalized functional form estimator, recently developed by jeffrey Wooldridge; and then we compare it empirically to the popular Box-Cox (BC) estimator using three data sets. We begin by briefly reviewing the drawbacks of the BC estimator. We Then introduce the nonlinear lest squares (NLS) alternative of Wooldridge which retains the desirable qualities of the BC estimator without the associated theoretical problems. We continue by applying both the BC and the NLS models to data from three classic hedonic regression studies and then compare the estimation resuts-point estimates, inferences and fitted values. The estimations include a wage rate equation, and two computer hedonic regression equations, one using data from a classic study by Gregory Chow and the other using an IBM data set that formed the basis of the new official BLS computer price index. 相似文献
116.
Tests of significance are often made in situations where the standard assumptions underlying the probability calculations do not hold. As a result, the reported significance levels become difficult to interpret. This article sketches an alternative interpretation of a reported significance level, valid in considerable generality. This level locates the given data set within the spectrum of other data sets derived from the given one by an appropriate class of transformations. If the null hypothesis being tested holds, the derived data sets should be equivalent to the original one. Thus, a small reported significance level indicates an unusual data set. This development parallels that of randomization tests, but there is a crucial technical difference: our approach involves permuting observed residuals; the classical randomization approach involves permuting unobservable, or perhaps nonexistent, stochastic disturbance terms. 相似文献
117.
David A. Freedman 《商业与经济统计学杂志》2013,31(1):123-124
In any sample survey, nonresponse bias is a potential issue. Even with a moderately high nonresponse rate, however, covariates can sometimes be used to show that the nonresponse bias is likely to be small. This note presents such an argument, which was used by the winning side in a tax case. 相似文献
118.
A vector autoregression is fit to recent U.S. data on wheat prices, wheat export sales, wheat export shipments, and exchange rates. Forecast error decompositions and out-of-sample forecasts indicate that exchange rates have little influence on wheat sales and shipments. 相似文献
119.
120.