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31.
Marianela Denegri María José Baeza Natalia Salinas-Oñate Verónica Peñaloza Horacio Miranda Ligia Orellana 《Social indicators research》2014,117(2):505-521
Many studies have used Richins and Dawson’s (J Consum Res 19: 303–316, 1992) Material Values Scale (MVS), applying it to different types of populations that exhibit a particular psychometric behavior, and showing little stability in their factorial structure. In the present study, 1,070 pedagogy students from the northern, central and southern regions of Chile answered the MVS. This sample was randomly divided in two. Using the first sub-sample (N = 539), an exploratory factorial analysis was carried out, from which a structure of nine items was grouped into two factors called “Social Success” and “Personal Happiness”, which presented adequate reliability. Later, with the second sub-sample (N = 531), the factorial structure indicated above was put to the test through a confirmatory factorial analysis. The data from the model show that the scale contains 8 items in total, grouped into two dimensions. The factorial loads are significant at the level of 1 %, which indicates that the 2-factor structure can be confirmed. Finally—using the proposed structure—the presence of the students’ material values was evaluated. 相似文献
32.
José-Marí Sarabia 《Econometric Reviews》2013,32(3):305-320
A hierarchy of Lorenz curves based on the generalized Tukey's Lambda distribution is proposed. Representations of the corresponding distribution and density function are also provided, together with popular inequality measures. Estimation methods are suggested. Finally, a comparison with other parametric families of Lorenz curves is established. 相似文献
33.
José-Luis Guerrero-Cusumano 《统计学通讯:理论与方法》2013,42(12):2985-3006
Two measures of dependence for multivariate t and Cauchy random variables are developed based on Kullback–Leibler number. The mutual information number T(X) is obtained in a closed expression form, as well as its asymptotic distribution. A dependence coefficient ρ1, is defined (based on the Kullback–Leibler number) with the properties of ρ1=0 indicating independence and ρ1=1indicating degeneracy. Two real life examples from the stock market are used to analyze the level of dependence and correlation among stocks. 相似文献
34.
Theory and Society - 相似文献
35.
José María Sarabia Enrique Castillo Marta Pascual María Sarabia 《Journal of Economic Inequality》2007,5(3):371-383
In this paper, the most general bivariate distribution with lognormal conditionals is fully characterized, using the methodology
proposed by [3]. The properties of the new family are studied in detail, including marginal and conditional distributions, regression functions,
dependence measures, moments and inequality measures. The new distribution is very broad, and contains as a particular case
the classical bivariate lognormal distribution. Several subfamilies are studied and a generalization of the basic model is
discussed. Finally, we present an empirical application. We estimate and compare the basic model proposed in the paper with
a classical model, using data from the European Community Household Panel in different periods of time. 相似文献
36.
37.
The estimation of variance-covariance matrices through optimization of an objective function, such as a log-likelihood function, is usually a difficult numerical problem. Since the estimates should be positive semi-definite matrices, we must use constrained optimization, or employ a parametrization that enforces this condition. We describe here five different parametrizations for variance-covariance matrices that ensure positive definiteness, thus leaving the estimation problem unconstrained. We compare the parametrizations based on their computational efficiency and statistical interpretability. The results described here are particularly useful in maximum likelihood and restricted maximum likelihood estimation in linear and non-linear mixed-effects models, but are also applicable to other areas of statistics. 相似文献
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AbstractIn this article, we proposed a new three parameter lifetime distribution motivated mainly by lifetime issues, which generalizes the Exponential Poisson distribution proposed by Cancho et al. (2011). We derive various standard mathematical properties of the proposed model including a formal proof of its probability density function and hazard rate function. The inference via the maximum likelihood approach is discussed. The performance of the maximum likelihood estimators, the likelihood ratio test and its power are studied by simulation. Finally, the proposed model is fitted to two real data sets and it is compared with several models. 相似文献