全文获取类型
收费全文 | 2449篇 |
免费 | 56篇 |
国内免费 | 15篇 |
专业分类
管理学 | 111篇 |
民族学 | 28篇 |
人才学 | 1篇 |
人口学 | 19篇 |
丛书文集 | 209篇 |
理论方法论 | 50篇 |
综合类 | 1556篇 |
社会学 | 42篇 |
统计学 | 504篇 |
出版年
2023年 | 17篇 |
2022年 | 11篇 |
2021年 | 20篇 |
2020年 | 23篇 |
2019年 | 35篇 |
2018年 | 32篇 |
2017年 | 70篇 |
2016年 | 45篇 |
2015年 | 50篇 |
2014年 | 101篇 |
2013年 | 227篇 |
2012年 | 119篇 |
2011年 | 138篇 |
2010年 | 126篇 |
2009年 | 124篇 |
2008年 | 143篇 |
2007年 | 150篇 |
2006年 | 149篇 |
2005年 | 136篇 |
2004年 | 159篇 |
2003年 | 147篇 |
2002年 | 106篇 |
2001年 | 100篇 |
2000年 | 76篇 |
1999年 | 32篇 |
1998年 | 31篇 |
1997年 | 20篇 |
1996年 | 21篇 |
1995年 | 28篇 |
1994年 | 25篇 |
1993年 | 19篇 |
1992年 | 10篇 |
1991年 | 4篇 |
1990年 | 7篇 |
1989年 | 8篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有2520条查询结果,搜索用时 15 毫秒
31.
Because outliers and leverage observations unduly affect the least squares regression, the identification of influential observations is considered an important and integrai part of the analysis. However, very few techniques have been developed for the residual analysis and diagnostics for the minimum sum of absolute errors, L1 regression. Although the L1 regression is more resistant to the outliers than the least squares regression, it appears that outliers (leverage) in the predictor variables may affect it. In this paper, our objective is to develop an influence measure for the L1 regression based on the likelihood displacement function. We illustrate the proposed influence measure with examples. 相似文献
32.
33.
A sequence of independent lifetimes X 1,…, X m , X m+1,…, X n were observed from inverse Weibull distribution with mean stress θ1 and reliability R 1(t 0) at time t 0 but later it was found that there was a change in the system at some point of time m and it is reflected in the sequence after X m by change in mean stress θ1 and in reliability R 2(t 0) at time t 0. The Bayes estimators of m, R 1(t 0) and R 2(t 0) are derived when a poor and a more detailed prior information is introduced into the inferential procedure. The effects of correct and wrong prior information on the Bayes estimators are studied. 相似文献
34.
Dankmar Bohning 《统计学通讯:理论与方法》2013,42(22):2645-2653
This note gives a condition which ensures convergence to an optimum of an algorithm suggested by Silvey, Titterington and Torsney (19 78) in the optimal design context. 相似文献
35.
A pivotal quantity for a capture-recapture model is introduced and used to construct an asymptotic confidence region for (ε,N), where ε is the capture efficiency and N is the population size. The true confidence levels of certain regions are obtained by simulation. Certain confidence regions for (ε,N) are drawn to show the size of the regions and to show how confidence limits for N depend on ε. 相似文献
36.
37.
For the linear-exponential distribution with increasing hazard rate, exact and explicit expressions for means, product moments and percentage points of order statistics are obtained. Some recurrence relations for both single and product moments of order statistics are also derived. These recurrence relations would enable one to obtain all the higher order moments of order statistics for all sample sizes from those of the lower order 相似文献
38.
Joseph Glaz 《统计学通讯:理论与方法》2013,42(8):2419-2454
In this article we review the major areas of remote sensing in the Russian literature for the period 1976 to 1985 that use statistical methods to analyze the observed data. For each of the areas, the problems that have been studied and the statistical techniques that have been used are briefly described 相似文献
39.
N. Mukhopadhyay 《统计学通讯:理论与方法》2013,42(8):2471-2506
The literature on sequential estimation problems for negative exponential populations has been reviewed here, We attempt to bring in all the published and unpublished materials known to us in a fairly coherent fashion. Both the concepts and theoretical findings are discussed. 相似文献
40.
We consider a new class of scale estimators with 50% breakdown point. The estimators are defined as order statistics of certain subranges. They all have a finite-sample breakdown point of [n/2]/n, which is the best possible value. (Here, [...] denotes the integer part.) One estimator in this class has the same influence function as the median absolute deviation and the least median of squares (LMS) scale estimator (i.e., the length of the shortest half), but its finite-sample efficiency is higher. If we consider the standard deviation of a subsample instead of its range, we obtain a different class of 50% breakdown estimators. This class contains the least trimmed squares (LTS) scale estimator. Simulation shows that the LTS scale estimator is nearly unbiased, so it does not need a small-sample correction factor. Surprisingly, the efficiency of the LTS scale estimator is less than that of the LMS scale estimator. 相似文献