全文获取类型
收费全文 | 4278篇 |
免费 | 56篇 |
国内免费 | 12篇 |
专业分类
管理学 | 233篇 |
民族学 | 8篇 |
人才学 | 1篇 |
人口学 | 37篇 |
丛书文集 | 83篇 |
理论方法论 | 24篇 |
综合类 | 1101篇 |
社会学 | 46篇 |
统计学 | 2813篇 |
出版年
2024年 | 1篇 |
2023年 | 18篇 |
2022年 | 16篇 |
2021年 | 29篇 |
2020年 | 53篇 |
2019年 | 113篇 |
2018年 | 113篇 |
2017年 | 239篇 |
2016年 | 111篇 |
2015年 | 113篇 |
2014年 | 121篇 |
2013年 | 1043篇 |
2012年 | 259篇 |
2011年 | 140篇 |
2010年 | 113篇 |
2009年 | 134篇 |
2008年 | 150篇 |
2007年 | 119篇 |
2006年 | 123篇 |
2005年 | 142篇 |
2004年 | 105篇 |
2003年 | 90篇 |
2002年 | 96篇 |
2001年 | 100篇 |
2000年 | 100篇 |
1999年 | 108篇 |
1998年 | 77篇 |
1997年 | 73篇 |
1996年 | 73篇 |
1995年 | 73篇 |
1994年 | 58篇 |
1993年 | 36篇 |
1992年 | 45篇 |
1991年 | 18篇 |
1990年 | 26篇 |
1989年 | 19篇 |
1988年 | 23篇 |
1987年 | 7篇 |
1986年 | 4篇 |
1985年 | 10篇 |
1984年 | 16篇 |
1983年 | 11篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 4篇 |
排序方式: 共有4346条查询结果,搜索用时 0 毫秒
71.
Dankmar Böhing 《Statistics》2013,47(4):487-495
Tn optimal experimental design theory there are well-known situations, in which additional constraints are implied to the design set. These constraints destroy in general the simplex structure of the set of feasible points of the design set. Thus the available iteration procedures for the unrestricted case are no longer applicable. In this paper a penalty approach is suggested which transforms the restricted problem to the unrestricted case and allows the application of well-known algorithms such as the Fedorov-Wynn-type or the projected gradient procedure. 相似文献
72.
We deal with experimental designs minimizing the mean square error of the linear BAYES estimator for the parameter vector of a multiple linear regression model where the experimental region is the k-dimensional unit sphere. After computing the uniquely determined optimum information matrix, we construct, separately for the homogeneous and the inhomogeneous model, both approximate and exact designs having such an information matrix. 相似文献
73.
This paper is heavily leaned on the author's recent investigations concerning SCHUR analysis of non-negative Hermitian block matrices. The parameters of the matrix balls and the triangular choice scheme which describe a non-negative Hermitian block matrix will be interpreted in the framework of correlation theory 相似文献
74.
Abstract The multivariate elliptically contoured distributions provide a viable framework for modeling time-series data. It includes the multivariate normal, power exponential, t, and Cauchy distributions as special cases. For multivariate elliptically contoured autoregressive models, we derive the exact likelihood equations for the model parameters. They are closely related to the Yule-Walker equations and involve simple function of the data. The maximum likelihood estimators are obtained by alternately solving two linear systems and illustrated using the simulation data. 相似文献
75.
Zhihua Liu 《统计学通讯:模拟与计算》2013,42(1):85-100
For a segmented regression system with an unknown changepoint over two domains of a predictor, a new empirical likelihood ratio statistic is proposed to test the null hypothesis of no change. Under the null hypothesis of no change, the proposed test statistic is shown empirically to be Gumbel distributed with robust location and scale estimators against various parameter settings and error distributions. A power analysis is conducted to illustrate the performance of the test. Under the alternative hypothesis with a changepoint, the test statistic is utilized to estimate the changepoint between the two domains. A comparison of the frequency distributions between the proposed estimator and two parametric methods indicates that the proposed method is effective in capturing the true changepoint. 相似文献
76.
Various programs in statistical packages for analysis of variance with unequal cell size give different results to the same data because of nonorthogonality of the main effects and interactions. This paper explains how these programs treat the problem of analysis of variance of unbalanced data. 相似文献
77.
We propose an algorithm to estimate the unknown constants in a multiple linear regression model under the minimum sum of weighted absolute errors (MSWAE). The proposed algorithm, a generalization of an earlier algorithm, is compared to a bounded variable algorithm. Some somputational experience is reported. 相似文献
78.
This article proposes a variable selection procedure for partially linear models with right-censored data via penalized least squares. We apply the SCAD penalty to select significant variables and estimate unknown parameters simultaneously. The sampling properties for the proposed procedure are investigated. The rate of convergence and the asymptotic normality of the proposed estimators are established. Furthermore, the SCAD-penalized estimators of the nonzero coefficients are shown to have the asymptotic oracle property. In addition, an iterative algorithm is proposed to find the solution of the penalized least squares. Simulation studies are conducted to examine the finite sample performance of the proposed method. 相似文献
79.
Optimal Designs for Binary Logistic Regression with a Qualitative Classifier with Independent Levels
Dose response studies arise in many medical applications. Often, such studies are considered within the framework of binary-response experiments such as success-failure. In such cases, popular choices for modeling the probability of response are logistic or probit models. Design optimality has been well studied for the logistic model with a continuous covariate. A natural extension of the logistic model is to consider the presence of a qualitative classifier. In this work, we explore D-, A-, and E-optimal designs in a two-parameter, binary logistic regression model after introducing a binary, qualitative classifier with independent levels. 相似文献
80.
The cost and time consumption of many industrial experimentations can be reduced using the class of supersaturated designs since this can be used for screening out the important factors from a large set of potentially active variables. A supersaturated design is a design for which there are fewer runs than effects to be estimated. Although there exists a wide study of construction methods for supersaturated designs, their analysis methods are yet in an early research stage. In this article, we propose a method for analyzing data using a correlation-based measure, named as symmetrical uncertainty. This method combines measures from the information theory field and is used as the main idea of variable selection algorithms developed in data mining. In this work, the symmetrical uncertainty is used from another viewpoint in order to determine more directly the important factors. The specific method enables us to use supersaturated designs for analyzing data of generalized linear models for a Bernoulli response. We evaluate our method by using some of the existing supersaturated designs, obtained according to methods proposed by Tang and Wu (1997) as well as by Koukouvinos et al. (2008). The comparison is performed by some simulating experiments and the Type I and Type II error rates are calculated. Additionally, Receiver Operating Characteristics (ROC) curves methodology is applied as an additional statistical tool for performance evaluation. 相似文献