全文获取类型
收费全文 | 7581篇 |
免费 | 113篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1063篇 |
民族学 | 44篇 |
人口学 | 644篇 |
丛书文集 | 22篇 |
理论方法论 | 633篇 |
综合类 | 70篇 |
社会学 | 3219篇 |
统计学 | 2000篇 |
出版年
2023年 | 44篇 |
2021年 | 49篇 |
2020年 | 108篇 |
2019年 | 171篇 |
2018年 | 187篇 |
2017年 | 275篇 |
2016年 | 193篇 |
2015年 | 126篇 |
2014年 | 200篇 |
2013年 | 1432篇 |
2012年 | 226篇 |
2011年 | 229篇 |
2010年 | 171篇 |
2009年 | 181篇 |
2008年 | 192篇 |
2007年 | 175篇 |
2006年 | 192篇 |
2005年 | 177篇 |
2004年 | 151篇 |
2003年 | 135篇 |
2002年 | 164篇 |
2001年 | 199篇 |
2000年 | 199篇 |
1999年 | 183篇 |
1998年 | 135篇 |
1997年 | 123篇 |
1996年 | 104篇 |
1995年 | 92篇 |
1994年 | 137篇 |
1993年 | 97篇 |
1992年 | 124篇 |
1991年 | 128篇 |
1990年 | 115篇 |
1989年 | 102篇 |
1988年 | 88篇 |
1987年 | 89篇 |
1986年 | 90篇 |
1985年 | 87篇 |
1984年 | 91篇 |
1983年 | 68篇 |
1982年 | 70篇 |
1981年 | 48篇 |
1980年 | 59篇 |
1979年 | 62篇 |
1978年 | 48篇 |
1977年 | 48篇 |
1976年 | 38篇 |
1975年 | 47篇 |
1974年 | 40篇 |
1971年 | 25篇 |
排序方式: 共有7695条查询结果,搜索用时 15 毫秒
961.
Paul K.H. Lin 《统计学通讯:理论与方法》2013,42(2):407-419
This paper presents the sinplesr procedure that uses wodular aryithmetic for constructing confounded designs for mixed factorial experiments. The present procedure and the classical one for confounding in symmetrical factorial experiments are both at the same mathema.tical level. The present procedure is written for practitioners and is lllustrared with several examples. 相似文献
962.
Robert K. Rayner 《统计学通讯:理论与方法》2013,42(10):2379-2392
This paper derives a test statistic for the variance-covariance parameters which is a quadratic function of their MINQUE (Minimum Norm Quadratic Unbiased Estimation) estimates. The test is a Wald-type test, and its development closely parallels the theory used to derive a similar test for the coefficients in linear models. In fact, the derivation proceeds by first setting up the estimation problem in a derived linear model in which the dispersion parameters are the coefficients. The test statistic is shown to be the sum of the squares of independent standardized x2 variables. 相似文献
963.
Simultaneous estimation of parameters with p (≥ 2) components, where each component has a generalized life distribution, is considered under a sum of squared error loss function. Improved estimators are obtained which dominate the maximum likelihood and the niinimum mean square estimators. Robustness of the improved estimators is shown even when the component distributions are dependent. The result is extended to the estimation of the system reliability when the components are connected in series. Several numerical studies are performed to demonstrate the risk improvement and the Pitman closeness of the new estimators. 相似文献
964.
A comparison between the two-sample t test and Satterthwaite's approximate F test is made, assuming the choice between these two tests is based on a preliminary test on the variances. Exact formulas for the sizes and powers of the tests are derived. Sizes and powers are then calculated and compared for several situations. 相似文献
965.
Classification procedures are examined in the case when the dimensionality exceeds the sample size. Two particular suggestions are (i) Principal components analysis and (ii) Two-step discriminant analysis. Comparisons are made in the two sample and the several sample cases. Extensions to growth curve model are investigated using the two stage discriminant analysis. 相似文献
966.
For the Bose-Einstein Statistics, where n indistinguishable balls are distributed in m urns such that all the arrangements are equally likely, define the random variables Mk = number of urns containing exactly k balls each; Nk = number of urns containing at least k balls each. We consider the approximation of the distributions of Mk and Nk by suitable normal distributions, for large but finite m. Estimates are found for the error in the approximation to both the probability mass function and the distribution function in each case. These results apply also to the alternative model where no urn is allowed to be empty. The results are illustrated by some numerical examples. 相似文献
967.
968.
969.
K. Afsarinejad 《统计学通讯:理论与方法》2013,42(11):3985-4028
Any experiment in which one or more of the experimental units is used more than once is called a repeated measurements experiment. The associated design of a repeated measurements experiment is referred to as a repeated measurements design. This review covers some known results on repeated measurements designs. Emphasis is placed on the impact of optimal design theory. Some construction methods for these designs are presented. Hedayat and Afsarinejad (1975) has an extensive bibliography of earlier literature. A bibliography of these designs published after 1974 is provided at the end of this paper. 相似文献
970.
The problem of classifying a covariance stationary normal time series is considered. Under certain regularity conditions, a compact form of the linear discriminant function in the sense of maximizing the Bhattacharyya distance is obtained. 相似文献