全文获取类型
收费全文 | 4031篇 |
免费 | 132篇 |
国内免费 | 28篇 |
专业分类
管理学 | 595篇 |
民族学 | 12篇 |
人才学 | 2篇 |
人口学 | 29篇 |
丛书文集 | 123篇 |
理论方法论 | 66篇 |
综合类 | 1208篇 |
社会学 | 117篇 |
统计学 | 2039篇 |
出版年
2024年 | 7篇 |
2023年 | 30篇 |
2022年 | 40篇 |
2021年 | 66篇 |
2020年 | 59篇 |
2019年 | 101篇 |
2018年 | 104篇 |
2017年 | 215篇 |
2016年 | 117篇 |
2015年 | 144篇 |
2014年 | 137篇 |
2013年 | 813篇 |
2012年 | 265篇 |
2011年 | 178篇 |
2010年 | 151篇 |
2009年 | 161篇 |
2008年 | 177篇 |
2007年 | 147篇 |
2006年 | 163篇 |
2005年 | 167篇 |
2004年 | 124篇 |
2003年 | 114篇 |
2002年 | 125篇 |
2001年 | 105篇 |
2000年 | 75篇 |
1999年 | 65篇 |
1998年 | 50篇 |
1997年 | 37篇 |
1996年 | 37篇 |
1995年 | 34篇 |
1994年 | 31篇 |
1993年 | 22篇 |
1992年 | 28篇 |
1991年 | 16篇 |
1990年 | 13篇 |
1989年 | 10篇 |
1988年 | 13篇 |
1987年 | 10篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 8篇 |
1983年 | 8篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 4篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有4191条查询结果,搜索用时 15 毫秒
121.
This paper establishes a nonparametric estimator for the treatment effect on censored bivariate data under unvariate censoring. This proposed estimator is based on the one from Lin and Ying(1993)'s nonparametric bivariate survival function estimator, which is itself a generalized version of Park and Park(1995)' quantile estimator. A Bahadur type representation of quantile functions were obtained from the marginal survival distribution estimator of Lin and Ying' model. The asymptotic property of this estimator is shown below and the simulation studies are also given 相似文献
122.
Ruth M. Mickey 《统计学通讯:理论与方法》2013,42(3):755-759
For a large series of IxJ tables, each containing two observations, the bias of the maximum likelihood estimates of log linear partial association parameters is shown to be equal to the parameters, regardless of the size of I and J. The partial association considered is that between row and column variables; the three way interactions are assumed to be O. This is a generalization of Andersen's results (1973a, 1973b) for a series of 2x2 tables. 相似文献
123.
汇编语言程序设计是计算机专业重要的基础课程,但由于其抽象、指令多等原因受到学生的忽视,实际教学效果很差。针对汇编语言程序设计的特点及目前教学现状,从改善教学效果和培养学生兴趣为出发点,对课程的教学内容、方法及手段进行探索,提高教学及实验效果,从而使汇编语言发挥其专业核心课的作用。 相似文献
124.
This paper presents three small sample tests for testing the heteroscedasticity among regression disturbances. The power of these tests are compared with two of the leading tests for this hypothesis, one by Goldfeld and Quandt [5] and the other by Theil [17]. We also provide a heuristic method of selecting the number of middle observations to be deleted for the Goldfeld-Quandt type of tests. 相似文献
125.
Zhihua Liu 《统计学通讯:模拟与计算》2013,42(1):85-100
For a segmented regression system with an unknown changepoint over two domains of a predictor, a new empirical likelihood ratio statistic is proposed to test the null hypothesis of no change. Under the null hypothesis of no change, the proposed test statistic is shown empirically to be Gumbel distributed with robust location and scale estimators against various parameter settings and error distributions. A power analysis is conducted to illustrate the performance of the test. Under the alternative hypothesis with a changepoint, the test statistic is utilized to estimate the changepoint between the two domains. A comparison of the frequency distributions between the proposed estimator and two parametric methods indicates that the proposed method is effective in capturing the true changepoint. 相似文献
126.
John Stufken 《统计学通讯:理论与方法》2013,42(11):3857-3863
We present a class of counerexamples for a conjecture on the existence or linear trend free block designs we will also prove a considerably weakened version of this conjecture which will determine all combinations of designs parmetres for which the class of linear trend free block designs is non empty. 相似文献
127.
赵一强 《淮海工学院学报(社会科学版)》2011,9(24):51-53
知识的社会价值具有二重性表现。从生产方式、经济发展和精神文明三个维度阐述了知识社会价值的三个正面性表现,同时从人体自身认识、人类生物性功能、人类文化、人类存在方式与安全性等方面对知识社会价值的负面性表现作了探索,认为,在知识发展过程中,知识社会价值的正面性和负面性在人的交往实践活动中构成一个辩证运动。 相似文献
128.
回族群众在花儿会上,不同于日常世俗生活的表现说明,花儿会是回族社会生活中二元结构下的特定时空。在这个特定时空里,回族群众完成了角色转换,以弥合现实生活和精神心理上的矛盾。 相似文献
129.
We study competition and coordination in a supply chain in which a single supplier both operates a direct channel and sells its product through multiple differentiated retailers. We study analytically the supply chain with symmetric retailers and find that the supplier prefers to have as many retailers as possible in the market, even if the retailers' equilibrium retail price is lower than that of the supplier, and even if the number of retailers and their cost or market advantage prevent sales through the direct channel. We find that the two‐channel supply chain may be subject to inefficiencies not present in the single‐channel supply chain. We show that several contracts known to coordinate a single‐channel supply chain do not coordinate the two‐channel supply chain; thus we propose a linear quantity discount contract and demonstrate its ability to perfectly coordinate the two‐channel supply chain with symmetric retailers. We provide some analytical results for the supply chain with asymmetric retailers and propose an efficient solution approach for finding the equilibrium. We find numerically that the supplier still benefits from having more retailers in the market and that linear quantity discount contracts can mitigate supply chain inefficiency, though they no longer achieve perfect coordination. 相似文献
130.
Kevin Glazebrook Colin Paterson Sandra Rauscher Thomas Archibald 《Production and Operations Management》2015,24(2):311-324
Lateral transshipments are a method of responding to shortages of stock in a network of inventory‐holding locations. Conventional reactive approaches only seek to meet immediate shortages. The study proposes hybrid transshipments which exploit economies of scale by moving additional stock between locations to prevent future shortages in addition to meeting immediate ones. The setting considered is motivated by retailers who operate networks of outlets supplying car parts via a system of periodic replenishment. It is novel in allowing non‐stationary stochastic demand and general patterns of dependence between multiple item types. The generality of our work makes it widely applicable. We develop an easy‐to‐compute quasi‐myopic heuristic for determining how hybrid transshipments should be made. We obtain simple characterizations of the heuristic and demonstrate its strong cost performance in both small and large networks in an extensive numerical study. 相似文献