全文获取类型
收费全文 | 19420篇 |
免费 | 727篇 |
国内免费 | 222篇 |
专业分类
管理学 | 2117篇 |
劳动科学 | 2篇 |
民族学 | 69篇 |
人才学 | 3篇 |
人口学 | 358篇 |
丛书文集 | 820篇 |
理论方法论 | 382篇 |
综合类 | 7948篇 |
社会学 | 583篇 |
统计学 | 8087篇 |
出版年
2024年 | 26篇 |
2023年 | 142篇 |
2022年 | 251篇 |
2021年 | 285篇 |
2020年 | 412篇 |
2019年 | 562篇 |
2018年 | 669篇 |
2017年 | 890篇 |
2016年 | 679篇 |
2015年 | 663篇 |
2014年 | 1018篇 |
2013年 | 3108篇 |
2012年 | 1435篇 |
2011年 | 1133篇 |
2010年 | 957篇 |
2009年 | 949篇 |
2008年 | 1039篇 |
2007年 | 965篇 |
2006年 | 884篇 |
2005年 | 768篇 |
2004年 | 641篇 |
2003年 | 543篇 |
2002年 | 479篇 |
2001年 | 412篇 |
2000年 | 281篇 |
1999年 | 229篇 |
1998年 | 146篇 |
1997年 | 135篇 |
1996年 | 87篇 |
1995年 | 89篇 |
1994年 | 65篇 |
1993年 | 61篇 |
1992年 | 62篇 |
1991年 | 56篇 |
1990年 | 37篇 |
1989年 | 30篇 |
1988年 | 30篇 |
1987年 | 16篇 |
1986年 | 13篇 |
1985年 | 24篇 |
1984年 | 19篇 |
1983年 | 16篇 |
1982年 | 21篇 |
1981年 | 15篇 |
1980年 | 10篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1977年 | 6篇 |
1975年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
Fatemeh Sogandi 《统计学通讯:模拟与计算》2017,46(3):2207-2227
In this article, a maximum likelihood estimator is derived in the generalized linear model-based regression profiles under monotonic change in Phase II. The performance of the proposed estimator is comprehensively investigated through some special cases, and compared with estimators under step change and drift. The results show that the proposed estimator has better performance in small and medium shifts under different increasing changes. Finally, the applicability of the proposed estimator is illustrated using a real case. 相似文献
992.
The composite quantile regression (CQR) has been developed for the robust and efficient estimation of regression coefficients in a liner regression model. By employing the idea of the CQR, we propose a new regression method, called composite kernel quantile regression (CKQR), which uses the sum of multiple check functions as a loss in reproducing kernel Hilbert spaces for the robust estimation of a nonlinear regression function. The numerical results demonstrate the usefulness of the proposed CKQR in estimating both conditional nonlinear mean and quantile functions. 相似文献
993.
In semidefinite programming (SDP), we minimize a linear objective function subject to a linear matrix being positive semidefinite. A powerful program, SeDuMi, has been developed in MATLAB to solve SDP problems. In this article, we show in detail how to formulate A-optimal and E-optimal design problems as SDP problems and solve them by SeDuMi. This technique can be used to construct approximate A-optimal and E-optimal designs for all linear and nonlinear regression models with discrete design spaces. In addition, the results on discrete design spaces provide useful guidance for finding optimal designs on any continuous design space, and a convergence result is derived. Moreover, restrictions in the designs can be easily incorporated in the SDP problems and solved by SeDuMi. Several representative examples and one MATLAB program are given. 相似文献
994.
M. B. M. B. K. Gawarammana 《统计学通讯:模拟与计算》2017,46(3):2103-2120
In this study, some methods suggested for binary repeated measures, namely, Weighted Least Squares (WLS), Generalized Estimating Equations (GEE), and Generalized Linear Mixed Models (GLMM) are compared with respect to power, type 1 error, and properties of estimates. The results indicate that with adequate sample size, no missing data, the only covariate being time effect, and a relatively limited number of time points, the WLS method performs well. The GEE approach performs well only for large sample sizes. The GLMM method is satisfactory with respect to type I error, but its estimates have poorer properties than the other methods. 相似文献
995.
Hrishikesh D. Vinod 《统计学通讯:模拟与计算》2017,46(6):4513-4534
New generalized correlation measures of 2012, GMC(Y|X), use Kernel regressions to overcome the linearity of Pearson's correlation coefficients. A new matrix of generalized correlation coefficients is such that when |r*ij| > |r*ji|, it is more likely that the column variable Xj is what Granger called the “instantaneous cause” or what we call “kernel cause” of the row variable Xi. New partial correlations ameliorate confounding. Various examples and simulations support robustness of new causality. We include bootstrap inference, robustness checks based on the dependence between regressor and error, and on the out-of-sample forecasts. Data for 198 countries on nine development variables support growth policy over redistribution and Deaton's criticism of foreign aid. Potential applications include Big Data, since our R code is available in the online supplementary material. 相似文献
996.
Philipp Otto 《统计学通讯:模拟与计算》2017,46(6):4547-4558
In applications of spatial statistics, it is necessary to compute the product of some matrix W of spatial weights and a vector y of observations. The weighting matrix often needs to be adapted to the specific problems, such that the computation of Wy cannot necessarily be done with available R-packages. Hence, this article suggests one possibility treating such issues. The proposed technique avoids the computation of the matrix product by calculating each entry of Wy separately. Initially, a specific spatial autoregressive process is introduced. The performance of the proposed program is briefly compared to a basic program using the matrix multiplication. 相似文献
997.
The kappa coefficient is a widely used measure for assessing agreement on a nominal scale. Weighted kappa is an extension of Cohen's kappa that is commonly used for measuring agreement on an ordinal scale. In this article, it is shown that weighted kappa can be computed as a function of unweighted kappas. The latter coefficients are kappa coefficients that correspond to smaller contingency tables that are obtained by merging categories. 相似文献
998.
Ehab F. Abd-Elfattah 《统计学通讯:模拟与计算》2017,46(6):4274-4280
Many nonparametric tests in one sample problem, matched pairs, and competingrisks under censoring have the same underlying permutation distribution. This article proposes a saddlepoint approximation to the exact p-values of these tests instead of the asymptotic approximations. The performance of the saddlepoint approximation is assessed by using simulation studies that show the superiority of the saddlepoint methods over the asymptotic approximations in several settings. The use of the saddlepoint to approximate the p-values of class of two sample tests under complete randomized design is also discussed. 相似文献
999.
Variable selection for semiparametric proportional hazards model under progressive Type-II censoring
Variable selection is an effective methodology for dealing with models with numerous covariates. We consider the methods of variable selection for semiparametric Cox proportional hazards model under the progressive Type-II censoring scheme. The Cox proportional hazards model is used to model the influence coefficients of the environmental covariates. By applying Breslow’s “least information” idea, we obtain a profile likelihood function to estimate the coefficients. Lasso-type penalized profile likelihood estimation as well as stepwise variable selection method are explored as means to find the important covariates. Numerical simulations are conducted and Veteran’s Administration Lung Cancer data are exploited to evaluate the performance of the proposed method. 相似文献
1000.
Based on B-spline basis functions and smoothly clipped absolute deviation (SCAD) penalty, we present a new estimation and variable selection procedure based on modal regression for partially linear additive models. The outstanding merit of the new method is that it is robust against outliers or heavy-tail error distributions and performs no worse than the least-square-based estimation for normal error case. The main difference is that the standard quadratic loss is replaced by a kernel function depending on a bandwidth that can be automatically selected based on the observed data. With appropriate selection of the regularization parameters, the new method possesses the consistency in variable selection and oracle property in estimation. Finally, both simulation study and real data analysis are performed to examine the performance of our approach. 相似文献