全文获取类型
收费全文 | 1773篇 |
免费 | 83篇 |
专业分类
管理学 | 225篇 |
民族学 | 26篇 |
人才学 | 1篇 |
人口学 | 235篇 |
丛书文集 | 4篇 |
理论方法论 | 169篇 |
综合类 | 32篇 |
社会学 | 768篇 |
统计学 | 396篇 |
出版年
2024年 | 5篇 |
2023年 | 20篇 |
2022年 | 30篇 |
2021年 | 47篇 |
2020年 | 72篇 |
2019年 | 117篇 |
2018年 | 157篇 |
2017年 | 153篇 |
2016年 | 118篇 |
2015年 | 65篇 |
2014年 | 102篇 |
2013年 | 298篇 |
2012年 | 108篇 |
2011年 | 65篇 |
2010年 | 64篇 |
2009年 | 54篇 |
2008年 | 49篇 |
2007年 | 38篇 |
2006年 | 39篇 |
2005年 | 31篇 |
2004年 | 32篇 |
2003年 | 20篇 |
2002年 | 22篇 |
2001年 | 20篇 |
2000年 | 12篇 |
1999年 | 11篇 |
1998年 | 15篇 |
1997年 | 10篇 |
1996年 | 15篇 |
1995年 | 13篇 |
1994年 | 8篇 |
1993年 | 2篇 |
1992年 | 9篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1969年 | 1篇 |
1968年 | 2篇 |
1964年 | 1篇 |
排序方式: 共有1856条查询结果,搜索用时 500 毫秒
991.
992.
A review of the CTP distribution: a comparison with other over- and underdispersed count data models
María José Olmo-Jiménez José Rodríguez-Avi Valentina Cueva-López 《Journal of Statistical Computation and Simulation》2018,88(14):2684-2706
The complex triparametric Pearson (CTP) distribution is a flexible model belonging to the Gaussian hypergeometric family that can account for over- and underdispersion. However, despite its good properties, not much attention has been paid to it. So, we revive the CTP comparing it with some well-known distributions that cope with overdispersion (negative binomial, generalized Poisson and univariate generalized Waring) as well as underdispersion (Conway–Maxwell–Poisson (CMP) and hyper-Poisson (HP)). We make a simulation study that reveals the performance of the CTP and shows that it has its own space among count data models. In this sense, we also explore some overdispersed datasets which seem to be more appropriately modelled by the CTP than by other usual models. Moreover, we include two underdispersed examples to illustrate that the CTP can provide similar fits to the CMP or HP (sometimes even more accurate) without the computational problems of these models. 相似文献
993.
Diego I. Gallardo Yolanda M. Gómez Mário de Castro 《Journal of Statistical Computation and Simulation》2018,88(11):2137-2149
Models for dealing with survival data in the presence of a cured fraction of individuals have attracted the attention of many researchers and practitioners in recent years. In this paper, we propose a cure rate model under the competing risks scenario. For the number of causes that can lead to the event of interest, we assume the polylogarithm distribution. The model is flexible in the sense it encompasses some well-known models, which can be tested using large sample test statistics applied to nested models. Maximum-likelihood estimation based on the EM algorithm and hypothesis testing are investigated. Results of simulation studies designed to gauge the performance of the estimation method and of two test statistics are reported. The methodology is applied in the analysis of a data set. 相似文献
994.
Guillermo Ferreira Nicolas Piña Emilio Porcu 《Journal of Statistical Computation and Simulation》2018,88(10):1903-1920
ABSTRACTWe study the asymptotic properties of the least-squares estimator for the trend function of a particular class of locally stationary models, which are defined by considering a smooth variation of the trend function. Additionally, errors are assumed to be realizations from a long-range dependent stationary Gaussian process. Our findings are then illustrated through Monte Carlo simulations. 相似文献
995.
The Variance Inflation Factor and the Condition Number are measures traditionally applied to detect the presence of collinearity in a multiple linear model. This paper presents the relation and the difference between both measures from theoretical and empirical perspectives by using Monte Carlo simulations and taking special interest in the computational techniques. 相似文献
996.
Luis Alberto Rodríguez-Picón Anna Patricia Rodríguez-Picón Luis Carlos Méndez-González Manuel I. Rodríguez-Borbón Alejandro Alvarado-Iniesta 《统计学通讯:模拟与计算》2018,47(6):1796-1810
The random effects in a gamma process are introduced in terms of its scale parameter. However, the scale parameter affects both its mean and variance. Hence, the variation of the degradation rates and the within degradation increments are expected to be large. For some products, the random effects affect just the rate or just the volatility of the process. Thus, two modifications of the parameters' structure of the gamma process are proposed. One implies that the random effects affect just the volatility and the second just the rate. A Bayesian estimation approach is provided and implemented in two case studies. 相似文献
997.
In this note, we derive upper bounds on the variance of a mixed random variable. Our results are an extension of previous results for unimodal and symmetric random variables. The novelty of our findings is that this mixed random variable does not necessarily need to be symmetric and is multimodal. We also characterize the cases when these bounds are optimal. 相似文献
998.
Credit unions differ in the types of financial services they offer to their members. This article explicitly models this observed heterogeneity using a generalized model of endogenous ordered switching. Our approach captures the endogenous choice that credit unions make when adding new products to their financial services mix. The model that we consider also allows for the dependence between unobserved effects and regressors in both the selection and outcome equations and can accommodate the presence of predetermined covariates in the model. We use this model to estimate returns to scale for U.S. retail credit unions from 1996 to 2011. We document strong evidence of persistent technological heterogeneity among credit unions offering different financial service mixes, which, if ignored, can produce quite misleading results. Employing our model, we find that credit unions of all types exhibit substantial economies of scale. 相似文献
999.
Rubén Manso Rafael Calama Marta Pardos Mathieu Fortin 《Journal of applied statistics》2018,45(12):2107-2127
In forestry, many processes of interest are binary and they can be modeled using lifetime analysis. However, available data are often incomplete, being interval- and right-censored as well as left-truncated, which may lead to biased parameter estimates. While censoring can be easily considered in lifetime analysis, left truncation is more complicated when individual age at selection is unknown. In this study, we designed and tested a maximum likelihood estimator that deals with left truncation by taking advantage of prior knowledge about the time when the individuals enter the experiment. Whenever a model is available for predicting the time of selection, the distribution of the delayed entries can be obtained using Bayes' theorem. It is then possible to marginalize the likelihood function over the distribution of the delayed entries in the experiment to assess the joint distribution of time of selection and time to event. This estimator was tested with continuous and discrete Gompertz-distributed lifetimes. It was then compared with two other estimators: a standard one in which left truncation was not considered and a second estimator that implemented an analytical correction. Our new estimator yielded unbiased parameter estimates with empirical coverage of confidence intervals close to their nominal value. The standard estimator leaded to an overestimation of the long-term probability of survival. 相似文献
1000.
Organizational learning capability has been considered an essential issue of an organization's effectiveness and potential to innovate and grow. Although its positive effects on organizations and employees are generally assumed, there is no empirical evidence of its positive association with employee attitudes such as job satisfaction. This paper aims to investigate the relationship between organizational learning capability and job satisfaction through the questionnaire responses of 157 employees from eight companies in the Spanish ceramic tile industry. Results suggest that organizational learning capability and job satisfaction are strongly linked. 相似文献