全文获取类型
收费全文 | 4137篇 |
免费 | 93篇 |
国内免费 | 12篇 |
专业分类
管理学 | 43篇 |
民族学 | 17篇 |
人口学 | 9篇 |
丛书文集 | 171篇 |
理论方法论 | 39篇 |
综合类 | 937篇 |
社会学 | 14篇 |
统计学 | 3012篇 |
出版年
2023年 | 10篇 |
2022年 | 11篇 |
2021年 | 30篇 |
2020年 | 54篇 |
2019年 | 106篇 |
2018年 | 151篇 |
2017年 | 276篇 |
2016年 | 93篇 |
2015年 | 94篇 |
2014年 | 168篇 |
2013年 | 1202篇 |
2012年 | 300篇 |
2011年 | 183篇 |
2010年 | 152篇 |
2009年 | 134篇 |
2008年 | 142篇 |
2007年 | 150篇 |
2006年 | 138篇 |
2005年 | 120篇 |
2004年 | 112篇 |
2003年 | 107篇 |
2002年 | 100篇 |
2001年 | 83篇 |
2000年 | 71篇 |
1999年 | 42篇 |
1998年 | 48篇 |
1997年 | 28篇 |
1996年 | 15篇 |
1995年 | 15篇 |
1994年 | 6篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 8篇 |
1989年 | 5篇 |
1988年 | 9篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 10篇 |
1984年 | 6篇 |
1983年 | 14篇 |
1982年 | 6篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有4242条查询结果,搜索用时 15 毫秒
101.
This article is concerned with efficient estimation in a semiparametric model. We consider pseudo maximum likelihood estimation and prove that the proposed estimator is asymptotically efficient in the sense of Cramér; that is, the estimator has the smallest mean squared error. 相似文献
102.
Abdulkadir A. Hussein Sévérien Nkurunziza Katrina Tomanelli 《Australian & New Zealand Journal of Statistics》2014,56(1):15-26
Aalen's nonparametric additive model in which the regression coefficients are assumed to be unspecified functions of time is a flexible alternative to Cox's proportional hazards model when the proportionality assumption is in doubt. In this paper, we incorporate a general linear hypothesis into the estimation of the time‐varying regression coefficients. We combine unrestricted least squares estimators and estimators that are restricted by the linear hypothesis and produce James‐Stein‐type shrinkage estimators of the regression coefficients. We develop the asymptotic joint distribution of such restricted and unrestricted estimators and use this to study the relative performance of the proposed estimators via their integrated asymptotic distributional risks. We conduct Monte Carlo simulations to examine the relative performance of the estimators in terms of their integrated mean square errors. We also compare the performance of the proposed estimators with a recently devised LASSO estimator as well as with ridge‐type estimators both via simulations and data on the survival of primary billiary cirhosis patients. 相似文献
103.
史全生 《扬州大学学报(人文社会科学版)》2014,(4):95-101
南社社友虽然在辛亥革命中发挥了巨大的积极作用,但自民国成立后便开始消沉失落。新文化运动中,为了重振南社昔日的雄风,迎上革命的新潮,柳亚子与叶楚伧等共同发起成立了新南社,制定章程,选举柳亚子为社长。国民党改组后由于柳亚子忙于党内斗争以及国民党右派的反对,新南社只存在一年即告停顿,却在宣传新三民主义和动员群众投身国民革命方面发挥了积极作用。 相似文献
104.
105.
K. V. Viswakala 《统计学通讯:理论与方法》2013,42(17):4367-4379
AbstractIn this paper we find the maximum likelihood estimates (MLEs) of hazard rate and mean residual life functions (MRLF) of Pareto distribution, their asymptotic non degenerate distribution, exact distribution and moments. We also discuss the uniformly minimum variance unbiased estimate (UMVUE) of hazard rate function and MRLF. Finally, two numerical examples with simulated data and real data set, are presented to illustrate the proposed estimates. 相似文献
106.
This paper concludes our comprehensive study on point estimation of model parameters of a gamma distribution from a second-order decision theoretic point of view. It should be noted that efficient estimation of gamma model parameters for samples ‘not large’ is a challenging task since the exact sampling distributions of the maximum likelihood estimators and its variants are not known. Estimation of a gamma scale parameter has received less attention from the earlier researchers compared to shape parameter estimation. What we have observed here is that improved estimation of the shape parameter does not necessarily lead to improved scale estimation if a natural moment condition (which is also the maximum likelihood restriction) is satisfied. Therefore, this work deals with the gamma scale parameter estimation as a separate new problem, not as a by-product of the shape parameter estimation, and studies several estimators in terms of second-order risk. 相似文献
107.
《统计学通讯:模拟与计算》2013,42(3):717-732
Abstract In this article we consider the problem of constructing confidence intervals for a linear regression model with unbalanced nested error structure. A popular approach is the likelihood-based method employed by PROC MIXED of SAS. In this article, we examine the ability of MIXED to produce confidence intervals that maintain the stated confidence coefficient. Our results suggest that intervals for the regression coefficients work well, but intervals for the variance component associated with the primary level cannot be recommended. Accordingly, we propose alternative methods for constructing confidence intervals on the primary level variance component. Computer simulation is used to compare the proposed methods. A numerical example and SAS code are provided to demonstrate the methods. 相似文献
108.
Yasumasa Matsuda 《统计学通讯:理论与方法》2013,42(9):2257-2273
In this paper, functional coefficient autoregressive (FAR) models proposed by Chen and Tsay (1993) are considered. We propose a diagnostic statistic for FAR models constructed by comparing between parametric and nonparametric estimators of the functional form of the FAR models. We show asymptotic properties of our statistic mathematically and it can be applied to the estimation of the delay parameter and the specification of the functional form of FAR models. 相似文献
109.
Mohammad Mahdi Maghami Mohammad Bahrami Farkhondeh Alsadat Sajadi 《Journal of applied statistics》2020,47(16):3030
A particular concerns of researchers in statistical inference is bias in parameters estimation. Maximum likelihood estimators are often biased and for small sample size, the first order bias of them can be large and so it may influence the efficiency of the estimator. There are different methods for reduction of this bias. In this paper, we proposed a modified maximum likelihood estimator for the shape parameter of two popular skew distributions, namely skew-normal and skew-t, by offering a new method. We show that this estimator has lower asymptotic bias than the maximum likelihood estimator and is more efficient than those based on the existing methods. 相似文献
110.
Ayman Baklizi 《统计学通讯:模拟与计算》2016,45(8):2937-2946
We consider confidence intervals for the stress–strength reliability Pr(X< Y) in the two-parameter exponential distribution. We have derived the Bayesian highest posterior density interval using non-informative prior distributions. We have compared its performance with the intervals based on the generalized pivot variable intervals in terms of their coverage probabilities and expected lengths. Our simulation study shows that the Bayesian interval performs better according to the criteria used, especially when the sample sizes are very small. An example is given. 相似文献