全文获取类型
收费全文 | 1815篇 |
免费 | 80篇 |
专业分类
管理学 | 300篇 |
民族学 | 16篇 |
人口学 | 189篇 |
丛书文集 | 18篇 |
理论方法论 | 151篇 |
综合类 | 130篇 |
社会学 | 818篇 |
统计学 | 273篇 |
出版年
2023年 | 24篇 |
2022年 | 18篇 |
2021年 | 22篇 |
2020年 | 58篇 |
2019年 | 67篇 |
2018年 | 78篇 |
2017年 | 105篇 |
2016年 | 80篇 |
2015年 | 54篇 |
2014年 | 83篇 |
2013年 | 226篇 |
2012年 | 208篇 |
2011年 | 74篇 |
2010年 | 55篇 |
2009年 | 52篇 |
2008年 | 43篇 |
2007年 | 53篇 |
2006年 | 40篇 |
2005年 | 45篇 |
2004年 | 93篇 |
2003年 | 93篇 |
2002年 | 70篇 |
2001年 | 45篇 |
2000年 | 30篇 |
1999年 | 12篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 11篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1993年 | 7篇 |
1992年 | 13篇 |
1991年 | 10篇 |
1990年 | 10篇 |
1989年 | 8篇 |
1988年 | 5篇 |
1987年 | 10篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1983年 | 6篇 |
1982年 | 8篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 5篇 |
1974年 | 4篇 |
1971年 | 2篇 |
1970年 | 2篇 |
1967年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有1895条查询结果,搜索用时 15 毫秒
931.
A Bayesian model consists of two elements: a sampling model and a prior density. The problem of selecting a prior density is nothing but the problem of selecting a Bayesian model where the sampling model is fixed. A predictive approach is used through a decision problem where the loss function is the squared L 2 distance between the sampling density and the posterior predictive density, because the aim of the method is to choose the prior that provides a posterior predictive density as good as possible. An algorithm is developed for solving the problem; this algorithm is based on Lavine's linearization technique. 相似文献
932.
A. R. de Leon 《统计学通讯:理论与方法》2013,42(1):129-141
In this paper we present a procedure for finding the optimal order of a response polynomial. the procedure is based on the prediction distribution of future observations. The maximal length of the structural β - expectation tolerance region for each polynomial is calculated. The minimun of these maximal determines the optimal order of the response polynomial 相似文献
933.
The article explores the relationship between distributions of order statistics from random vectors with exchangeable normal distributions and several skewed generalizations of the normal distribution. In particular, we show that the order statistics of exchangeable normal observations have closed skew-normal distributions, and that the corresponding density function is log-concave when the order statistic is extreme. Special attention is given to the bivariate case, which is related to the univariate skew-normal distribution. The applications discussed focus on the lifetimes of coherent systems. 相似文献
934.
Xavier de Luna 《Journal of applied statistics》2014,41(8):1767-1784
We evaluate the effects of college choice on earnings using Swedish register databases. This case study is used to motivate the introduction of a novel procedure to analyse the sensitivity of such an observational study to the assumption made that there are no unobserved confounders – variables affecting both college choice and earnings. This assumption is not testable without further information, and should be considered an approximation of reality. To perform a sensitivity analysis, we measure the departure from the unconfoundedness assumption with the correlation between college choice and earnings when conditioning on observed covariates. The use of a correlation as a measure of dependence allows us to propose a standardised procedure by advocating the use of a fixed value for the correlation, typically 1% or 5%, when checking the sensitivity of an evaluation study. A correlation coefficient is, moreover, intuitive to most empirical scientists, which makes the results of our sensitivity analysis easier to communicate than those of previously proposed methods. In our evaluation of the effects of college choice on earnings, the significantly positive effect obtained could not be questioned by a sensitivity analysis allowing for unobserved confounders inducing at most 5% correlation between college choice and earnings. 相似文献
935.
Mário de Castro Ming‐Hui Chen Joseph G. Ibrahim John P. Klein 《Scandinavian Journal of Statistics》2014,41(1):187-199
In this paper, we propose a general class of Gamma frailty transformation models for multivariate survival data. The transformation class includes the commonly used proportional hazards and proportional odds models. The proposed class also includes a family of cure rate models. Under an improper prior for the parameters, we establish propriety of the posterior distribution. A novel Gibbs sampling algorithm is developed for sampling from the observed data posterior distribution. A simulation study is conducted to examine the properties of the proposed methodology. An application to a data set from a cord blood transplantation study is also reported. 相似文献
936.
We give a general procedure to characterize multivariate distributions by using products of the hazard gradient and mean residual life components. This procedure is applied to characterize multivariate distributions as Gumbel exponential, Lomax, Burr, Pareto and generalized Pareto multivariate distributions. Our results extend the results of several authors and can be used to study how to extend univariate models to the multivariate set-up. 相似文献
937.
Josenildo de Souza Chaves 《统计学通讯:模拟与计算》2013,42(3):364-382
In survival data analysis it is frequent the occurrence of a significant amount of censoring to the right indicating that there may be a proportion of individuals in the study for which the event of interest will never happen. This fact is not considered by the ordinary survival theory. Consequently, the survival models with a cure fraction have been receiving a lot of attention in the recent years. In this article, we consider the standard mixture cure rate model where a fraction p 0 of the population is of individuals cured or immune and the remaining 1 ? p 0 are not cured. We assume an exponential distribution for the survival time and an uniform-exponential for the censoring time. In a simulation study, the impact caused by the informative uniform-exponential censoring on the coverage probabilities and lengths of asymptotic confidence intervals is analyzed by using the Fisher information and observed information matrices. 相似文献
938.
A Bayesian method for making inferences on the degree of dependence for a positively quadrant dependent distribution is developed. This method is based on a parametric model, where the parameter measures the degree of association. The parametric model is a natural simplification of the original one: it is a mixture of the two extreme cases corresponding to independence and positive extremal dependence. 相似文献
939.
940.
Piet de Jong 《商业与经济统计学杂志》2013,31(4):539-548
The efficient handling of provisional economic time series data is considered. Procedures are justified in terms of a testable hypothesis regarding the nature of data revisions. The hypothesis leads to explicit and practical variance expressions for measurement errors. Testing and estimation issues are dealt with. An efficient dual filter is developed for recursive signal estimation. Techniques are applied to the Canadian index of production data. 相似文献