全文获取类型
收费全文 | 1848篇 |
免费 | 73篇 |
国内免费 | 19篇 |
专业分类
管理学 | 114篇 |
劳动科学 | 1篇 |
民族学 | 5篇 |
人口学 | 29篇 |
丛书文集 | 94篇 |
理论方法论 | 25篇 |
综合类 | 1078篇 |
社会学 | 34篇 |
统计学 | 560篇 |
出版年
2024年 | 3篇 |
2023年 | 8篇 |
2022年 | 21篇 |
2021年 | 19篇 |
2020年 | 27篇 |
2019年 | 39篇 |
2018年 | 56篇 |
2017年 | 50篇 |
2016年 | 53篇 |
2015年 | 55篇 |
2014年 | 89篇 |
2013年 | 254篇 |
2012年 | 126篇 |
2011年 | 120篇 |
2010年 | 102篇 |
2009年 | 88篇 |
2008年 | 82篇 |
2007年 | 108篇 |
2006年 | 131篇 |
2005年 | 73篇 |
2004年 | 74篇 |
2003年 | 72篇 |
2002年 | 63篇 |
2001年 | 36篇 |
2000年 | 26篇 |
1999年 | 29篇 |
1998年 | 19篇 |
1997年 | 13篇 |
1996年 | 16篇 |
1995年 | 15篇 |
1994年 | 14篇 |
1993年 | 8篇 |
1992年 | 8篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 9篇 |
1988年 | 7篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有1940条查询结果,搜索用时 250 毫秒
1.
This article considers statistical inference for the heteroscedastic partially linear varying coefficient models. We construct an efficient estimator for the parametric component by applying the weighted profile least-squares approach, and show that it is semiparametrically efficient in the sense that the inverse of the asymptotic variance of the estimator reaches the semiparametric efficiency bound. Simulation studies are conducted to illustrate the performance of the proposed method. 相似文献
2.
We study the asymptotic behavior of the marginal expected shortfall when the two random variables are asymptotic independent but positively associated, which is modeled by the so-called tail dependent coefficient. We construct an estimator of the marginal expected shortfall, which is shown to be asymptotically normal. The finite sample performance of the estimator is investigated in a small simulation study. The method is also applied to estimate the expected amount of rainfall at a weather station given that there is a once every 100 years rainfall at another weather station nearby. 相似文献
3.
通过对2000年上证30指数股市盈率水平及其影响因素进行实证分析,可以发现,其中股息支付率、每股收益增长率、行业平均市盈率对股票P/E值起主要的解释作用,而股本规模因素,解释力却有限,除每股收益增长率外,各变量的相关性与理论分析基本一致. 相似文献
4.
5.
Michael P. Fay Ji-Hyun Lee 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2006,169(1):81-96
Summary. We detail a general method for measuring agreement between two statistics. An application is two ratios of directly standardized rates which differ only by the choice of the standard. If the statistics have a high value for the coefficient of agreement then the expected squared difference between the statistics is small relative to the variance of the average of the two statistics, and inferences vary little by changing statistics. The estimation of a coefficient of agreement between two statistics is not straightforward because there is only one pair of observed values, each statistic calculated from the data. We introduce estimators of the coefficient of agreement for two statistics and discuss their use, especially as applied to functions of standardized rates. 相似文献
6.
Pierre Legendre François-Joseph Lapointe 《Australian & New Zealand Journal of Statistics》2004,46(4):615-629
A test of congruence among distance matrices is described. It tests the hypothesis that several matrices, containing different types of variables about the same objects, are congruent with one another, so they can be used jointly in statistical analysis. Raw data tables are turned into similarity or distance matrices prior to testing; they can then be compared to data that naturally come in the form of distance matrices. The proposed test can be seen as a generalization of the Mantel test of matrix correspondence to any number of distance matrices. This paper shows that the new test has the correct rate of Type I error and good power. Power increases as the number of objects and the number of congruent data matrices increase; power is higher when the total number of matrices in the study is smaller. To illustrate the method, the proposed test is used to test the hypothesis that matrices representing different types of organoleptic variables (colour, nose, body, palate and finish) in single‐malt Scotch whiskies are congruent. 相似文献
7.
我国第三产业发展及劳动就业增长的实证分析 总被引:2,自引:0,他引:2
首先介绍了我国第三产业发展的现状 ,然后通过计算第三产业发展过程中的劳动就业贡献率和就业弹性 ,分析了我国第三产业发展吸纳劳动力的潜力。最后对第三产业发展及扩大就业提出几点建议。 相似文献
8.
利用扩展的线性支出系统模型(ELES),采用最小二乘法估计计算了我国农村居民的短期医疗服务需求价格弹性。研究结果表明:农村居民的短期医疗服务需求价格缺乏弹性。由于农村居民的短期医疗服务需求价格缺乏弹性,加上我国目前医疗体制存在的以药养医和医疗机构的逐利行为以及医疗市场缺乏有效的监管等问题,导致农村居民看病难、看病贵。解决这个问题,需要国家增加对卫生领域的投入,降低农民看病时自费的比例,增强卫生市场的竞争性,适当使医疗卫生资源向农村地区倾斜,并逐渐把医疗机构办成非盈利机构。 相似文献
9.
Backfitting Random Varying-Coefficient Models with Time-Dependent Smoothing Covariates 总被引:1,自引:0,他引:1
Abstract. In this paper, we propose a random varying-coefficient model for longitudinal data. This model is different from the standard varying-coefficient model in the sense that the time-varying coefficients are assumed to be subject-specific, and can be considered as realizations of stochastic processes. This modelling strategy allows us to employ powerful mixed-effects modelling techniques to efficiently incorporate the within-subject and between-subject variations in the estimators of time-varying coefficients. Thus, the subject-specific feature of longitudinal data is effectively considered in the proposed model. A backfitting algorithm is proposed to estimate the coefficient functions. Simulation studies show that the proposed estimation methods are more efficient in finite-sample performance compared with the standard local least squares method. An application to an AIDS clinical study is presented to illustrate the proposed methodologies. 相似文献
10.