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 328 毫秒
921.
Pranab Kumar Sen 《统计学通讯:理论与方法》2013,42(7):2245-2266
In multi-parameter ( multivariate ) estimation, the Stein rule provides minimax and admissible estimators , compromising generally on their unbiasedness. On the other hand, the primary aim of jack-knifing is to reduce the bias of an estimator ( without necessarily compromising on its efficacy ), and, at the same time, jackknifing provides an estimator of the sampling variance of the estimator as well. In shrinkage estimation ( where minimization of a suitably defined risk function is the basic goal ), one may wonder how far the bias-reduction objective of jackknifing incorporates the dual objective of minimaxity ( or admissibility ) and estimating the risk of the estimator ? A critical appraisal of this basic role of jackknifing in shrinkage estimation is made here. Restricted, semi-restricted and the usual versions of jackknifed shrinkage estimates are considered and their performance characteristics are studied . It is shown that for Pitman-type ( local ) alternatives, usually, jackkntfing fails to provide a consistent estimator of the ( asymptotic ) risk of the shrinkage estimator, and a degenerate asymptotic situation arises for the usual fixed alternative case. 相似文献
922.
Kazuhiro Ohtani 《统计学通讯:理论与方法》2013,42(10):2863-2876
In this paper, we derive the exact distribution and density functions of the Stein-type estimator for the normal variance. It is shown by numerical evaluation that the density function of the Stein-type estimator is unimodal and concentrates around the mode more than that of the usual estimator. 相似文献
923.
Jye-Chyi Lu 《统计学通讯:理论与方法》2013,42(10):3725-3739
Accelerated life testing of products quickly yields information on life. In this article, we present a simple method to incorporate the information collected from accelerated life tests of both components and (series) systems. The multivariate Weibull distribution of Hougaard is applied to model lifetimes of components. Least-squares (LS) estimators of the model parameters and their joint asymptotic distribution are derived. The effects of the dependence parameter and the proportion of the system-data to the asymptotic relative efficiencies of the LS estimators are investigated. 相似文献
924.
This paper considers the estimation of multivariate random effects that are measured with error, but for which there are no replications. Using structural simplification of the correlation of the data, separate estimates are generated for the covariance of the random effects and the covariance of the error. An estimator of the random effects based on a truncated eigen structure is defined, and matrix mean squared error and its trace (risk) are analyzed, with comparison to the maximum likelihood estimator (m.l.e) and also to the Stein-like estimator of Efron and Morris (1972). It is shown that the estimator has risk which is smaller than the risk of the maximum likelihood estimator and the Efron-Morris estimator in most cases. 相似文献
925.
Consider a system which is subject to failure and must be replaced when this occurs. If it costs less to replace the system in advance before failure, it may be advantageous to use an age replacement policy. However, the optimal age to replace the system is unknown if the underlying failure distribution is unknown. This paper develops a scheme to update the current estimate of the optimal age replacement policy in an on-line fashion and simultaneously controlling costs by reducing system failures. 相似文献
926.
Robert C. Tumbleson 《The American statistician》2013,67(1):7-11
This article compares the accuracy of the median unbiased estimator with that of the maximum likelihood estimator for a logistic regression model with two binary covariates. The former estimator is shown to be uniformly more accurate than the latter for small to moderately large sample sizes and a broad range of parameter values. In view of the recently developed efficient algorithms for generating exact distributions of sufficient statistics in binary-data problems, these results call for a serious consideration of median unbiased estimation as an alternative to maximum likelihood estimation, especially when the sample size is not large, or when the data structure is sparse. 相似文献
927.
An algorithm is presented for computing an exact nonparametric interval estimate of the slope parameter in a simple linear regression model. The confidence interval is obtained by inverting the hypothesis test for slope that uses Spearman's rho. This method is compared to an exact procedure based on Kendall's tau. The Spearman rho procedure will generally give exact levels of confidence closer to desired levels, especially in small samples. Monte carlo results comparing these two methods with the parametric procedure are given 相似文献
928.
Jesse Frey 《Journal of statistical planning and inference》2011,141(11):3632-3639
We derive recursive algorithms for computing first-order and second-order inclusion probabilities for ranked-set sampling from a finite population. These algorithms make it practical to compute inclusion probabilities even for relatively large sample and population sizes. As an application, we use the inclusion probabilities to examine the performance of Horvitz-Thompson estimators under different varieties of balanced ranked-set sampling. We find that it is only for balanced Level 2 sampling that the Horvitz-Thompson estimator can be relied upon to outperform the simple random sampling mean estimator. 相似文献
929.
In this paper, a difference-in-regression estimator is proposed by using two auxiliary variables in simple random sampling. Variance of proposed estimator up to the first order of approximation is compared with other competing estimators. Additionally, by taking the known value of one of the population regression coefficients, another version of the proposed estimator is also obtained. The proposed estimator is found optimum in the class of estimators based on two auxiliary variables. A simulation study is carried out in support with theoretical results. If only the means of auxiliary variables are available, another estimator can be obtained for large trivariate normal population. 相似文献
930.
Artur Bryk 《统计学通讯:理论与方法》2013,42(4):520-531
We consider a fixed-design regression model with long-range-dependent errors and introduce an artificial randomization of grid points at which observations are taken in order to diminish the impact of strong dependence. The resulting estimator is shown to exhibit smoothing dichotomy with the variance in both cases, diminishing more quickly than in the fixed-design case. 相似文献