全文获取类型
收费全文 | 2091篇 |
免费 | 43篇 |
国内免费 | 3篇 |
专业分类
管理学 | 32篇 |
人口学 | 6篇 |
丛书文集 | 1篇 |
理论方法论 | 3篇 |
综合类 | 22篇 |
统计学 | 2073篇 |
出版年
2023年 | 8篇 |
2022年 | 3篇 |
2021年 | 16篇 |
2020年 | 38篇 |
2019年 | 68篇 |
2018年 | 104篇 |
2017年 | 162篇 |
2016年 | 59篇 |
2015年 | 56篇 |
2014年 | 70篇 |
2013年 | 819篇 |
2012年 | 176篇 |
2011年 | 47篇 |
2010年 | 48篇 |
2009年 | 47篇 |
2008年 | 40篇 |
2007年 | 35篇 |
2006年 | 26篇 |
2005年 | 34篇 |
2004年 | 31篇 |
2003年 | 23篇 |
2002年 | 30篇 |
2001年 | 22篇 |
2000年 | 13篇 |
1999年 | 20篇 |
1998年 | 31篇 |
1997年 | 19篇 |
1996年 | 10篇 |
1995年 | 7篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1990年 | 7篇 |
1989年 | 3篇 |
1988年 | 9篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 9篇 |
1984年 | 4篇 |
1983年 | 11篇 |
1982年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有2137条查询结果,搜索用时 125 毫秒
971.
Several estimators are examined for the simple linear regression model under a controlled, experimental situation with multiple observations at each design point. The model is examined under normal and non-normal error distributions and mild heterogeneity of variances across the chosen design points. We consider the ordinary, generalized, and estimated generalized least squares estimators and several examples of M estimators. The asymptotic properties of the M estimator using the Huber ψ are presented under these conditions for the multiple regression model. A simulation study is also presented which indicates that the M estimator possesses strong robustness properties under the presence of both non-normality and mild heteroscedasticity o£ errors. Finally, the M estimates are compared to the least squares estimates in two examples. 相似文献
972.
The simultaneous estimation of a mean vector is explored by reparametrizing it into its direction and norm components. A type of Pythagorean relation is employed to construct an estimate of the norm component, which results in solving an ordinary amerenuai equation, me james-Diem estimator is snown to be optimum in a class of estimators derived from general solutions of the ordinary differential equation. A new Stein-type estimator in the case of the inverse Gaussian distribution is constructed. 相似文献
973.
In this paper we first address the problem of estimating the common scale of several exponential distributions with unknown location parameters when censored samples are observed. The improved estimators are basically Stein type testimators. These testimators are then used to construct improved estimators of location parameters. 相似文献
974.
《统计学通讯:理论与方法》2013,42(12):2583-2599
In the present paper an estimator of the error variance for a three-way layout in random effects model incorporating two preliminary tests of significance has been proposed. It has been well recognized that estimation of parameters, of interest under asymmetric loss function (ASL) is generally better than that under squared error loss function (SELF), particularly where overestimation and underestimation are not equally penalised. As neither overestimation nor underestimation of error variance is desirable, with this motivation, the proposed estimator for the error variance has been studied under LINEX loss function. It is claimed that, with proper choice of degree of asymmetry and level of significance, proposed the sometimes pool estimator performs fairly better than unbiased estimator. Recommendations regarding its application have been attempted. 相似文献
975.
Dafeng Chen 《统计学通讯:理论与方法》2013,42(5):1275-1281
The Fourier integral estimator (FIE) of the hazard rate function have been introduced by Singpurwalla and Wong (1983) in order to improve the rate of convergence of mean square error. However, the asymptotic properties are derived under several assumptions. These assumptions are too strong to be satisfied in most applications. The situation becomes worse when some of these assumptions appear contradictory to each other. This greatly limits the usage of FIE. This paper endeavors to release or weaken some of these assumptions and therefore expand the applicable coverage of FIE. 相似文献
976.
Heinz Gillert 《Statistics》2013,47(2):217-226
A class of homogeneous MARKOV chains with arbitrary intial distributions is considered, which in general contains also the class treated by BILLINGSLEY [2]. The existence of strongly consistent and asymptotically normal maximum-likelihood estimates for unknown parameters is shown. Also the case of a random sample size is treated. 相似文献
977.
978.
Hidehiko Kamiya 《统计学通讯:理论与方法》2019,48(12):3092-3104
Elliptically contoured distributions generalize the multivariate normal distributions in such a way that the density generators need not be exponential. However, as the name suggests, elliptically contoured distributions remain to be restricted in that the proportional density level sets ought to be ellipsoids. In star-shaped distributions, this restriction is relaxed and the density level sets are allowed to be boundaries of arbitrary proportional star-shaped sets. In this note, we propose a non parametric estimator of the shape of density level sets of star-shaped distributions, and prove its strong consistency with respect to the Hausdorff distance. We illustrate our estimator with simulated and real data. 相似文献
979.
980.
Shahjahan Khan 《统计学通讯:理论与方法》2013,42(3):507-527
Improved James-Stein type estimation of the mean vector μ of a multovaroate Student-t population of dimension p with ν degrees of freedom is considered. In addition to the sample data, uncertain prior information on the value of the mean vector, in the form of a null hypothesis, is used for the estiamtion. The usual maximum liklihood estimator((mle) of μ is obtained and a test statistic for testing H0:μ=μ0 is derived. Based on the mle of μ and the tes statistic the preliminary test estimator (PTE), Stein-type shrinkage estimator (SE) and positive-rule shrinkage esiimator (PRSE) are defined. The bias and the quadratic risk of the estimators are evaiuated. The relative performances of the estimators are mvestigated by analyzing the risks under different condltlons It is observed that the FRSE dommates over he other three estimators, regardless of the vaiidity of the null hypothesis and the value ν. 相似文献