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101.
目的:考察大学生关于能力与热情的内隐混合性别刻板印象。方法:从某高校选取90名大学生,采用两个内隐联想测验(IAT)探讨大学生是否对男女两性存在热情和能力两个内容维度的混合刻板印象。结果:与女性相比,大学生更多地将消极热情和积极能力与男性相联系;与男性相比,被试更多地将积极热情和消极能力与女性相联系。结论:被试对男性存在着消极热情—积极能力的内隐混合性别刻板印象,对女性存在积极热情—消极能力的内隐混合性别刻板印象。 相似文献
102.
杨春立 《北京邮电大学学报(社会科学版)》2014,(4):70-77
为量化信息产业对经济增长的作用,通过对投入产出模型进行结构化分解,测算了2007和2012年我国信息产业的乘数效应、反馈效应和溢出效应。结果表明,溢出效应最为显著,这说明信息产业投入越高,对其他产业的贡献也越高。同时,基于2001—2012年29个省份面板数据,采用向量自回归模型和面板Granger因果检验,分析了信息产业对经济增长的效用机制,验证了信息产业对经济增长的直接贡献和间接贡献。结果表明,信息产业和国内生产总值(GDP)之间存在协整关系,信息产业与经济增长双向相关性显著,经济增长是信息产业增长的同质Granger因,各省份GDP以相同的效用机制影响信息产业;信息产业是GDP的异质Granger因,各省份信息产业的增长以不同机制影响GDP增长。 相似文献
103.
《Journal of Statistical Computation and Simulation》2012,82(6):769-785
In this article, a group sequential test (GST) of non-parametric statistics for survival data is briefly reviewed. An asymptotic joint distribution of the test statistics, obtained after each interim analysis, is given to illustrate the applicability of the critical values of the GST procedures. It should be noted that censored observations are generally seen in survival data. Therefore, if one makes power calculations irrespective of censoring, reliable results may not be achieved, due to the lack of information about the censoring structure. A wide simulation study, covering different censoring rates and tied observations, is conducted to make the power comparisons under various scenarios. The simulation results are interpreted and compared with the results obtained by using power analysis and sample size (PASS) software. 相似文献
104.
We propose new dependence measures for two real random variables not necessarily linearly related. Covariance and linear correlation
are expressed in terms of principal components and are generalized for variables distributed along a curve. Properties of
these measures are discussed. The new measures are estimated using principal curves and are computed for simulated and real
data sets. Finally, we present several statistical applications for the new dependence measures. 相似文献
105.
M. Schemper 《统计学通讯:理论与方法》2013,42(13):1655-1665
The present paper surveys tests with censored sur-vival data for 2-and k-samples and for association by a framework which classifies them into complete or restric-ted permutation tests and into tests based on U-or Savage-scores. The formulae of the resulting twelve tests are briefly described for quick reference. Some of the tests have been applied frequently in the past as the tests by Mantel, Breslow or Gehan; others have been developed rather recently, partly by the author. The concluding discussion presents the results of a simulation study, clarifying similarities and differences of the restricted and complete permutation approach, and deals with rela-tive efficiencies of the two scoring systems. 相似文献
106.
Hideyuki Douke 《统计学通讯:理论与方法》2013,42(12):3015-3029
In this study we discuss the group sequential procedures for comparing two treatments based on multivariate observations in clinical trials. Also we suppose that a response vector on each of two treatments has a multivariate normal distribution with unknown covariance matrix. Then we propose a group sequential x2 statistic in order to carry out repeated significance test for hypothesis of no difference between two population mean vectors. In order to realize the group sequential test where average sample number is reduced, we propose another modified group sequential x2 statistic by extension of Jennison and Turnbull ( 1991 ). After construction of repeated confidence boundaries for making the repeated significance test, we compare two group sequential procedures based on two statistics regarding the average sample number and the power of the test in the simulations. 相似文献
107.
In comparing several regressions E(yij) =αi + βixij i = 1, 2, ..., k, j = 1,2, ..., ni, researchers are generally interested in the following five problems: whether they have (1) equal slope, (2) equal intercept, (3) coincidence, (4) common intersection on X-axis, and (5) common intersection on (X,Y) - plane. Problems (1) - (3) can be put into the framework of the general linear hypothesis and the F-test can be used. However, problems (4) and (5) cannot be put into the general linear hypothesis because they are ratios of parameters. Hence, in this paper we consider the generalized likelihood ratio test for hypothesis testing. An application to an enzyme kinetics problem in Aniline Metabolism is demonstrated 相似文献
108.
Thomas W. O'Gorman 《Revue canadienne de statistique》2001,29(3):459-471
The author proposes an adaptive method which produces confidence intervals that are often narrower than those obtained by the traditional procedures. The proposed methods use both a weighted least squares approach to reduce the length of the confidence interval and a permutation technique to insure that its coverage probability is near the nominal level. The author reports simulations comparing the adaptive intervals to the traditional ones for the difference between two population means, for the slope in a simple linear regression, and for the slope in a multiple linear regression having two correlated exogenous variables. He is led to recommend adaptive intervals for sample sizes superior to 40 when the error distribution is not known to be Gaussian. 相似文献
109.
J. N. Adichie 《统计学通讯:理论与方法》2013,42(11):985-997
For the problem of testing the equality of slopes of several regression lines against the alternative that the slopes are in increasing (decreasing) order of magnitude, two types of tests are proposed. These are the likelihood ratio test and a test that depends on suitable linear combination of one group statistics. Rank analogues of the two tests are also examined. 相似文献
110.
Oscar Kempthore 《统计学通讯:理论与方法》2013,42(8):763-777
This paper discusses the role of significance testing, in contrast to hypothesis testing. It takes the view that the two processes must be differentiated because they are in fact different even though they possess some common mathematical features. A supporting view of significance testing is presented. Difficulties and obscurities are discussed. 相似文献