全文获取类型
收费全文 | 7071篇 |
免费 | 180篇 |
国内免费 | 65篇 |
专业分类
管理学 | 304篇 |
民族学 | 28篇 |
人才学 | 4篇 |
人口学 | 67篇 |
丛书文集 | 606篇 |
理论方法论 | 123篇 |
综合类 | 4777篇 |
社会学 | 155篇 |
统计学 | 1252篇 |
出版年
2024年 | 15篇 |
2023年 | 36篇 |
2022年 | 45篇 |
2021年 | 50篇 |
2020年 | 74篇 |
2019年 | 124篇 |
2018年 | 131篇 |
2017年 | 186篇 |
2016年 | 142篇 |
2015年 | 182篇 |
2014年 | 328篇 |
2013年 | 620篇 |
2012年 | 442篇 |
2011年 | 390篇 |
2010年 | 365篇 |
2009年 | 357篇 |
2008年 | 409篇 |
2007年 | 470篇 |
2006年 | 492篇 |
2005年 | 419篇 |
2004年 | 375篇 |
2003年 | 344篇 |
2002年 | 290篇 |
2001年 | 279篇 |
2000年 | 176篇 |
1999年 | 84篇 |
1998年 | 79篇 |
1997年 | 62篇 |
1996年 | 47篇 |
1995年 | 56篇 |
1994年 | 53篇 |
1993年 | 42篇 |
1992年 | 32篇 |
1991年 | 22篇 |
1990年 | 19篇 |
1989年 | 31篇 |
1988年 | 19篇 |
1987年 | 12篇 |
1986年 | 6篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有7316条查询结果,搜索用时 671 毫秒
141.
《Scandinavian Journal of Statistics》2018,45(3):792-805
When sampling from a continuous population (or distribution), we often want a rather small sample due to some cost attached to processing the sample or to collecting information in the field. Moreover, a probability sample that allows for design‐based statistical inference is often desired. Given these requirements, we want to reduce the sampling variance of the Horvitz–Thompson estimator as much as possible. To achieve this, we introduce different approaches to using the local pivotal method for selecting well‐spread samples from multidimensional continuous populations. The results of a simulation study clearly indicate that we succeed in selecting spatially balanced samples and improve the efficiency of the Horvitz–Thompson estimator. 相似文献
142.
This study develops a robust automatic algorithm for clustering probability density functions based on the previous research. Unlike other existing methods that often pre-determine the number of clusters, this method can self-organize data groups based on the original data structure. The proposed clustering method is also robust in regards to noise. Three examples of synthetic data and a real-world COREL dataset are utilized to illustrate the accurateness and effectiveness of the proposed approach. 相似文献
143.
Hiroshi Yamada 《统计学通讯:理论与方法》2018,47(5):1022-1027
The Hodrick–Prescott (HP) filtering is frequently used in macroeconometrics to decompose time series, such as real gross domestic product, into their trend and cyclical components. Because the HP filtering is a basic econometric tool, it is necessary to have a precise understanding of the nature of it. This article contributes to the literature by listing several (penalized) least-squares problems that are related to the HP filtering, three of which are newly introduced in the article, and showing their properties. We also remark on their generalization. 相似文献
144.
It is known that the normal approximation is applicable for sums of non negative random variables, W, with the commonly employed couplings. In this work, we use the Stein’s method to obtain a general theorem of non uniform exponential bound on normal approximation base on monotone size bias couplings of W. Applications of the main result to give the bound on normal approximation for binomial random variable, the number of bulbs on at the terminal time in the lightbulb process, and the number of m runs are also provided. 相似文献
145.
Adrianna Kezar 《International Journal of Social Research Methodology》2016,19(2):143-160
In this article, we describe ways that the Delphi technique can be extended from its more traditional approaches and processes in order to make it a tool for scholars using participatory methods. This innovative proposed approach is called the change-oriented Delphi. We describe this innovative approach using an example from our own work to create solutions to the growth of non-tenure-track faculty in higher education institutions, which is negatively impacting student outcomes. 相似文献
146.
Seasonal fractional ARIMA (ARFISMA) model with infinite variance innovations is used in the analysis of seasonal long-memory time series with large fluctuations (heavy-tailed distributions). Two methods, which are the empirical characteristic function (ECF) procedure developed by Knight and Yu [The empirical characteristic function in time series estimation. Econometric Theory. 2002;18:691–721] and the Two-Step method (TSM) are proposed to estimate the parameters of stable ARFISMA model. The ECF method estimates simultaneously all the parameters, while the TSM considers in the first step the Markov Chains Monte Carlo–Whittle approach introduced by Ndongo et al. [Estimation of long-memory parameters for seasonal fractional ARIMA with stable innovations. Stat Methodol. 2010;7:141–151], combined with the maximum likelihood estimation method developed by Alvarez and Olivares [Méthodes d'estimation pour des lois stables avec des applications en finance. Journal de la Société Française de Statistique. 2005;1(4):23–54] in the second step. Monte Carlo simulations are also used to evaluate the finite sample performance of these estimation techniques. 相似文献
147.
卫星导航定位是测绘工程中发展较快、应用较广的一项热门技术,“GPS测量与数据处理”课程也一直是测绘专业本科教学的主干课程,具有更新快、理论深、实践性强等特点,对教师授课及学生学习都具有较高的要求。文章对东华理工大学测绘工程专业GPS课程的授课内容、授课方式、实践教学及考核模式等方面存在的问题进行了分析,并提出了相应的教学改革建议。 相似文献
148.
149.
美国作为世界上最发达的资本主义国家,其公民教育是成功的,美国公民教育的成功源于其方法的成功。探究美国公民教育方法,借鉴其宝贵经验,对建立一套符合我国实际的思想政治教育方法体系,促进我国思想政治教育的健康发展,具有重要的现实意义。 相似文献
150.
《Journal of Statistical Computation and Simulation》2012,82(3):241-249
In this paper, we investigate four existing and three new confidence interval estimators for the negative binomial proportion (i.e., proportion under inverse/negative binomial sampling). An extensive and systematic comparative study among these confidence interval estimators through Monte Carlo simulations is presented. The performance of these confidence intervals are evaluated in terms of their coverage probabilities and expected interval widths. Our simulation studies suggest that the confidence interval estimator based on saddlepoint approximation is more appealing for large coverage levels (e.g., nominal level≤1% ) whereas the score confidence interval estimator is more desirable for those commonly used coverage levels (e.g., nominal level>1% ). We illustrate these confidence interval construction methods with a real data set from a maternal congenital heart disease study. 相似文献