全文获取类型
收费全文 | 3898篇 |
免费 | 107篇 |
国内免费 | 31篇 |
专业分类
管理学 | 122篇 |
劳动科学 | 1篇 |
民族学 | 37篇 |
人才学 | 1篇 |
人口学 | 82篇 |
丛书文集 | 286篇 |
理论方法论 | 67篇 |
综合类 | 2045篇 |
社会学 | 83篇 |
统计学 | 1312篇 |
出版年
2024年 | 5篇 |
2023年 | 23篇 |
2022年 | 22篇 |
2021年 | 29篇 |
2020年 | 64篇 |
2019年 | 77篇 |
2018年 | 85篇 |
2017年 | 136篇 |
2016年 | 87篇 |
2015年 | 80篇 |
2014年 | 149篇 |
2013年 | 617篇 |
2012年 | 246篇 |
2011年 | 188篇 |
2010年 | 178篇 |
2009年 | 150篇 |
2008年 | 204篇 |
2007年 | 258篇 |
2006年 | 228篇 |
2005年 | 206篇 |
2004年 | 183篇 |
2003年 | 182篇 |
2002年 | 144篇 |
2001年 | 132篇 |
2000年 | 87篇 |
1999年 | 41篇 |
1998年 | 41篇 |
1997年 | 23篇 |
1996年 | 32篇 |
1995年 | 24篇 |
1994年 | 12篇 |
1993年 | 17篇 |
1992年 | 20篇 |
1991年 | 10篇 |
1990年 | 10篇 |
1989年 | 7篇 |
1988年 | 9篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 1篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1976年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有4036条查询结果,搜索用时 15 毫秒
111.
本文在对语用级别性存在于言语交际中的原因以及其对言 语交际产生的利弊进行分析的基础上,着重通过礼貌原则内部的级别性 和语用原则间的级别性两个方面探讨了在言语交际中把握语用级别性的 关键:以得体为要领,结合交际对象、内容、目的及背景适量、适中、适宜、 适用并适可而止地运用语用级别性来形成自己的交际技巧和谈吐风格。 相似文献
112.
In 1960 Levene suggested a potentially robust test of homogeneity of variance based on an ordinary least squares analysis of variance of the absolute values of mean-based residuals. Levene's test has since been shown to have inflated levels of significance when based on the F-distribution, and tests a hypothesis other than homogeneity of variance when treatments are unequally replicated, but the incorrect formulation is now standard output in several statistical packages. This paper develops a weighted least squares analysis of variance of the absolute values of both mean-based and median-based residuals. It shows how to adjust the residuals so that tests using the F -statistic focus on homogeneity of variance for both balanced and unbalanced designs. It shows how to modify the F -statistics currently produced by statistical packages so that the distribution of the resultant test statistic is closer to an F-distribution than is currently the case. The weighted least squares approach also produces component mean squares that are unbiased irrespective of which variable is used in Levene's test. To complete this aspect of the investigation the paper derives exact second-order moments of the component sums of squares used in the calculation of the mean-based test statistic. It shows that, for large samples, both ordinary and weighted least squares test statistics are equivalent; however they are over-dispersed compared to an F variable. 相似文献
113.
In survey research, it is assumed that reported response by the individual is correct. However, given the issues of prestige bias, self-respect, respondent's reported data often produces estimated values which are highly deviated from the true values. This causes measurement error (ME) to be present in the sample estimates. In this article, the estimation of population mean in the presence of measurement error using information on a single auxiliary variable is studied. A generalized estimator of population mean is proposed. The class of estimators is obtained by using some conventional and non-conventional measures. Simulation and numerical study is also conducted to assess the performance of estimators in the presence and absence of measurement error. 相似文献
114.
Burcin Coskun 《Journal of Statistical Computation and Simulation》2019,89(16):3118-3136
In this paper, two new multiple influential observation detection methods, GCD.GSPR and mCD*, are introduced for logistic regression. The proposed diagnostic measures are compared with the generalized difference in fits (GDFFITS) and the generalized squared difference in beta (GSDFBETA), which are multiple influential diagnostics. The simulation study is conducted with one, two and five independent variable logistic regression models. The performance of the diagnostic measures is examined for a single contaminated independent variable for each model and in the case where all the independent variables are contaminated with certain contamination rates and intensity. In addition, the performance of the diagnostic measures is compared in terms of the correct identification rate and swamping rate via a frequently referred to data set in the literature. 相似文献
115.
A smoothed bootstrap method is presented for the purpose of bandwidth selection in nonparametric hazard rate estimation for iid data. In this context, two new bootstrap bandwidth selectors are established based on the exact expression of the bootstrap version of the mean integrated squared error of some approximations of the kernel hazard rate estimator. This is very useful since Monte Carlo approximation is no longer needed for the implementation of the two bootstrap selectors. A simulation study is carried out in order to show the empirical performance of the new bootstrap bandwidths and to compare them with other existing selectors. The methods are illustrated by applying them to a diabetes data set. 相似文献
116.
The concept of reciprocal coordinate subtangent (RCST) has been used as a useful tool to study the monotone behavior of a continuous density function and for characterizing probability distributions. In this paper, we propose a non-parametric estimator for RCST based on the censored dependent data. Asymptotic properties of the estimator are established under suitable regularity conditions. A simulation study is carried out to examine the performance of the estimator. The usefulness of the estimator is also examined through a real data. 相似文献
117.
In this paper, we consider the laws of large numbers for NSD random variables satisfying Pareto-type distributions with infinite means. Based on the Pareto-Zipf distributions, some weak laws of large numbers for weighted sums of NSD random variables are obtained. Meanwhile, we show that a weak law for Pareto-Zipf distributions cannot be extended to a strong law. Furthermore, based on the two tailed Pareto distribution, a strong law of large numbers for weighed NSD random variables is presented. Our results extend the corresponding earlier ones. 相似文献
118.
S. Mehr Mansour 《统计学通讯:理论与方法》2019,48(12):2893-2903
Asymptotic methods are commonly used in statistical inference for unknown parameters in binary data models. These methods are based on large sample theory, a condition which may be in conflict with small sample size and hence leads to poor results in the optimal designs theory. In this paper, we apply the second order expansions of the maximum likelihood estimator and derive a matrix formula for the mean square error (MSE) to obtain more precise optimal designs based on the MSE. Numerical results indicate the new optimal designs are more efficient than the optimal designs based on the information matrix. 相似文献
119.
In this paper, we analytically derive the exact formula for the mean squared error (MSE) of two weighted average (WA) estimators for each individual regression coefficient. Further, we execute numerical evaluations to investigate small sample properties of the WA estimators, and compare the MSE performance of the WA estimators with the other shrinkage estimators and the usual OLS estimator. Our numerical results show that (1) the WA estimators have smaller MSE than the other shrinkage estimators and the OLS estimator over a wide region of parameter space; (2) the range where the relative MSE of the WA estimator is smaller than that of the OLS estimator gets narrower as the number of explanatory variables k increases. 相似文献
120.
合肥学院经济系课题组 《合肥学院学报(社会科学版)》2007,24(5):41-45
2003年以来,我国政府在对固定资产"投资过热"几大行业加大宏观调控力度之后,又对"逐步过热"的房地产市场相继出台了包括土地使用、金融、交易、房价一系列调控政策,目的是促使我国房地产行业更加健康、有序发展。这些政策在具体实施过程中,各地会因经济不同而产生不同的影响,而这又会反作用于市场,进而产生正、负双面的效应。为证明这一点,仅以浙江、安徽两省为例来予以分析,并在此基础上得出一些结论。 相似文献