全文获取类型
收费全文 | 4414篇 |
免费 | 69篇 |
国内免费 | 18篇 |
专业分类
管理学 | 225篇 |
劳动科学 | 1篇 |
民族学 | 7篇 |
人口学 | 40篇 |
丛书文集 | 131篇 |
理论方法论 | 32篇 |
综合类 | 1300篇 |
社会学 | 49篇 |
统计学 | 2716篇 |
出版年
2024年 | 1篇 |
2023年 | 16篇 |
2022年 | 20篇 |
2021年 | 31篇 |
2020年 | 61篇 |
2019年 | 106篇 |
2018年 | 134篇 |
2017年 | 224篇 |
2016年 | 84篇 |
2015年 | 97篇 |
2014年 | 158篇 |
2013年 | 1124篇 |
2012年 | 320篇 |
2011年 | 143篇 |
2010年 | 155篇 |
2009年 | 124篇 |
2008年 | 157篇 |
2007年 | 155篇 |
2006年 | 148篇 |
2005年 | 139篇 |
2004年 | 125篇 |
2003年 | 102篇 |
2002年 | 83篇 |
2001年 | 99篇 |
2000年 | 101篇 |
1999年 | 81篇 |
1998年 | 65篇 |
1997年 | 59篇 |
1996年 | 74篇 |
1995年 | 59篇 |
1994年 | 40篇 |
1993年 | 31篇 |
1992年 | 38篇 |
1991年 | 12篇 |
1990年 | 29篇 |
1989年 | 17篇 |
1988年 | 21篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 11篇 |
1984年 | 9篇 |
1983年 | 9篇 |
1982年 | 7篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 3篇 |
排序方式: 共有4501条查询结果,搜索用时 15 毫秒
31.
Nicholas T. Longford 《Statistics and Computing》2003,13(1):67-80
The weaknesses of established model selection procedures based on hypothesis testing and similar criteria are discussed and an alternative based on synthetic (composite) estimation is proposed. It is developed for the problem of prediction in ordinary regression and its properties are explored by simulations for the simple regression. Extensions to a general setting are described and an example with multiple regression is analysed. Arguments are presented against using a selected model for any inferences. 相似文献
32.
It is often of interest to find the maximum or near maxima among a set of vector‐valued parameters in a statistical model; in the case of disease mapping, for example, these correspond to relative‐risk “hotspots” where public‐health intervention may be needed. The general problem is one of estimating nonlinear functions of the ensemble of relative risks, but biased estimates result if posterior means are simply substituted into these nonlinear functions. The authors obtain better estimates of extrema from a new, weighted ranks squared error loss function. The derivation of these Bayes estimators assumes a hidden‐Markov random‐field model for relative risks, and their behaviour is illustrated with real and simulated data. 相似文献
33.
给出了四元数体Q上n×n分块矩阵为亚(半)正定自共轭矩阵的一个充要条件,进而给出了Q上矩阵方程XAnm=Bnm有亚(半)正定自共轭四元数矩阵解的充要条件及解集合的显式表示,从而推广改进了数城上线性方程组的反问题及矩阵反问题的相应结果. 相似文献
34.
李开灿 《湖北师范学院学报(哲学社会科学版)》1996,(6)
利用随机变量的投影关系,定义了偏方差矩阵,从而导出了逆方差阵元素的一种形式在随机变量是正态的条件,它为判别条件独立性有方便的操作办法。 相似文献
35.
Jarrett J. Barber Alan E. Gelfand John A. Silander 《Revue canadienne de statistique》2006,34(4):659-676
The authors consider the issue of map positional error, or the difference between location as represented in a spatial database (i.e., a map) and the corresponding unobservable true location. They propose a fully model‐based approach that incorporates aspects of the map registration process commonly performed by users of geographic informations systems, including rubber‐sheeting. They explain how estimates of positional error can be obtained, hence estimates of true location. They show that with multiple maps of varying accuracy along with ground truthing data, suitable model averaging offers a strategy for using all of the maps to learn about true location. 相似文献
36.
Eugene Seneta 《Australian & New Zealand Journal of Statistics》2002,44(4):385-400
The death, in Sydney, of Oliver Lancaster marks the end of an era in the histories of the Statistical Society of Australia, which (in its previous existence as the Statistical Society of New South Wales) he helped found in 1947, and of the Australian Journal of Statistics of which he was founding editor (1959–1971). Oliver Lancaster was Foundation Professor of Mathematical Statistics at the University of Sydney (1959–1978), where he spent his life as student and academic. During his academic career, he achieved scholarly distinction in at least four fields: mathematical statistics, medical and public health statistics, the history of medicine and of statistics, and statistical bibliography. With E.J.G. Pitman (1897–1993), M.H. Belz (1897–1975), E.A. Cornish (1909–1973) and P.A.P. Moran (1917–1988) he was part of a cohort of renowned Australian mathematical statisticians who laid the foundation of the glory days of Australian mathematical statistics. This obituary and tribute focuses on some of these aspects, within a broader historical picture. 相似文献
37.
Marco Francesconi 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2005,168(3):539-566
Summary. The paper performs an evaluation of the data that were collected in the sixth wave of the British Household Panel Survey (BHPS) on childhood family structure. After comparing such data with a large number of studies by using external sources, we find that the BHPS data overestimate the proportion of people who report an experience of life in a non-intact family during childhood by about 10%. Although an explanation based on recall error that deteriorates with the age of the BHPS respondents is possible, the overestimation is likely to be accounted for by non-ignorable attrition that may affect most of the comparison studies based on longitudinal data. Conversely, comparisons with other independent measurements from the BHPS itself reveal that the wave 6 data underestimate the proportion of young people who have lived at least part of their childhood in a non-intact family by about 8%. The probability of disagreement between these two sets of measures is strongly associated with poor interview characteristics, which may affect the comparison measure more than the wave 6 measure. Despite such differences, there is therefore a substantial degree of similarity between the family structure information that was collected in the sixth wave of the BHPS and the host of highly diverse records against which it has been compared. 相似文献
38.
黄廷祝 《电子科技大学学报(社会科学版)》1996,(6)
研究大型线性方程组迭代解法中分块JACOBI迭代阵的收敛性。采用块矩阵分析方法和谱半径降维估计法得到块Jacobi迭代阵收敛的实用充分条件。 相似文献
39.
We consider the problem of estimating the scale parameter of an exponential or a gamma distribution under squared error loss when the scale parameter θ is known to be greater than some fixed value θ0. Natural estimators in this setting include truncated linear functions of the sufficient statistic. Such estimators are typically inadmissible, but explicit improvements seem difficult to find. Some are presented here. A particularly interesting finding is that estimators which are admissible in the untruncated problem which take values only in the interior of the truncated parameter space are found to be inadmissible for the truncated problem. 相似文献
40.
给出了求解常系数线性齐次微分方程组和常系数线性齐次差分方程组的一个方法,指出了这两种方程组之间存在的一个有趣关系. 相似文献