全文获取类型
收费全文 | 1775篇 |
免费 | 57篇 |
国内免费 | 15篇 |
专业分类
管理学 | 50篇 |
民族学 | 30篇 |
人口学 | 20篇 |
丛书文集 | 183篇 |
理论方法论 | 45篇 |
综合类 | 1189篇 |
社会学 | 48篇 |
统计学 | 282篇 |
出版年
2024年 | 5篇 |
2023年 | 7篇 |
2022年 | 15篇 |
2021年 | 14篇 |
2020年 | 31篇 |
2019年 | 23篇 |
2018年 | 33篇 |
2017年 | 25篇 |
2016年 | 34篇 |
2015年 | 46篇 |
2014年 | 82篇 |
2013年 | 193篇 |
2012年 | 126篇 |
2011年 | 98篇 |
2010年 | 87篇 |
2009年 | 74篇 |
2008年 | 111篇 |
2007年 | 129篇 |
2006年 | 109篇 |
2005年 | 116篇 |
2004年 | 113篇 |
2003年 | 101篇 |
2002年 | 75篇 |
2001年 | 50篇 |
2000年 | 52篇 |
1999年 | 15篇 |
1998年 | 12篇 |
1997年 | 14篇 |
1996年 | 11篇 |
1995年 | 13篇 |
1994年 | 8篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1978年 | 1篇 |
排序方式: 共有1847条查询结果,搜索用时 31 毫秒
971.
The logrank test procedure for testing bivariate symmetry against asymmetry in matched-pair data is proposed. The presented test statistic is based on Mantel-Haenszel type statistics evaluated at diagonal grid points on the plane obtained from distinct uncensored failure times. The asymptotic results of the proposed test are derived and an example is shown to illustrate the methodology. 相似文献
972.
Gauss M. Cordeiro 《统计学通讯:理论与方法》2013,42(13):2720-2737
Explicit expansions for the moments of some Kumaraswamy generalized (Kw-G) distributions (Cordeiro and de Castro, 2011) are derived using special functions. We explore the Kw-normal, Kw-gamma, Kw-beta, Kw-t, and Kw-F distributions. These expressions are given as infinite weighted linear combinations of well-known special functions for which numerical routines are readily available. 相似文献
973.
ABSTRACTThe present investigation deals with the problem of estimation of population mean in two-phase sampling. In the presence of two auxiliary variables, some classes of estimators have been proposed through predictive approach. Properties of the proposed classes of estimators have been studied, and the unbiased versions of these estimators along with their approximate variance expressions are obtained under simple random sampling without replacement scheme. The respective optimum strategies of the proposed estimators are discussed, and their empirical and graphical comparisons with some contemporary estimators of population mean have been made. Suitable recommendations to the survey practitioner are given. 相似文献
974.
In the past decade a number of fixed sampling methods have been developed for selecting the "best" or at least a "good" subset of vaiable in regression analysis. We are interested in deriving a sequential selection procedure to select a subset of a random size including equations. Tables for an example are given at the end of this paper 相似文献
975.
Consider a linear regression model with [p-1] predictor variables which is taken as the "true" model.The goal Is to select a subset of all possible reduced models such that all inferior models ‘to be defined’ are excluded with a guaranteed minimum probability.A procedure is proposed for which the exact evaluation of the probability of a correct decision 1s difficult; however, 1t is shown that the probability requirement can be met for sufficiently large sample size.Monte Carlo evaluation of the constant associated with the procedure and some ways to reduce the amount of computations Involved in the Implementation of the procedure are discussed. 相似文献
976.
977.
978.
Let X and Y have two-parameter Burr XII distributions. The maximum-likelihood estimator of δ=P(X<Y) is studied under the progressively first failure-censored samples. Three confidence intervals of δ are constructed by using an asymptotic distribution of the maximum-likelihood estimator of δ and two bootstrapping procedures, respectively. Some computational results from intensive simulations are presented. An illustrative example is provided to demonstrate the application of the proposed method. 相似文献
979.
980.
《Journal of homosexuality》2012,59(4):522-540
ABSTRACTThe purpose of this study was to explore the relationship between perception of own appearance, Internet pornography consumption, preferences for pornographic actors’ appearance, and sexual self-esteem in gay and bisexual men in Norway. An online survey of 477 gay and bisexual men showed that, despite the prevailing muscular and lean gay body ideal, many men with less ideal bodies also preferred to watch pornographic actors with body types similar to their own. Self-perceived attractiveness, having an ideal body type, and viewing Internet pornography in longer sessions each made a unique contribution to higher self-esteem as a sexual partner. Preferring to watch pornographic actors with ideal bodies was not related to sexual self-esteem. The findings underscore the importance for gay or bisexual men of both self-perceived attractiveness and being athletic or young and fit, for a positive self-evaluation of sexual performance and competence. 相似文献