全文获取类型
收费全文 | 1985篇 |
免费 | 120篇 |
国内免费 | 3篇 |
专业分类
管理学 | 471篇 |
民族学 | 20篇 |
人才学 | 1篇 |
人口学 | 77篇 |
丛书文集 | 103篇 |
理论方法论 | 60篇 |
综合类 | 619篇 |
社会学 | 121篇 |
统计学 | 636篇 |
出版年
2024年 | 1篇 |
2023年 | 9篇 |
2022年 | 9篇 |
2021年 | 31篇 |
2020年 | 52篇 |
2019年 | 52篇 |
2018年 | 51篇 |
2017年 | 63篇 |
2016年 | 54篇 |
2015年 | 62篇 |
2014年 | 96篇 |
2013年 | 257篇 |
2012年 | 143篇 |
2011年 | 151篇 |
2010年 | 105篇 |
2009年 | 116篇 |
2008年 | 114篇 |
2007年 | 76篇 |
2006年 | 88篇 |
2005年 | 65篇 |
2004年 | 58篇 |
2003年 | 40篇 |
2002年 | 60篇 |
2001年 | 38篇 |
2000年 | 36篇 |
1999年 | 34篇 |
1998年 | 17篇 |
1997年 | 20篇 |
1996年 | 10篇 |
1995年 | 21篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 25篇 |
1991年 | 15篇 |
1990年 | 23篇 |
1989年 | 8篇 |
1988年 | 17篇 |
1987年 | 10篇 |
1986年 | 11篇 |
1985年 | 9篇 |
1984年 | 10篇 |
1983年 | 13篇 |
1982年 | 7篇 |
1981年 | 2篇 |
1980年 | 8篇 |
1979年 | 1篇 |
排序方式: 共有2108条查询结果,搜索用时 15 毫秒
91.
Partial Order Theory has been recently more and more employed in applied science to overcome the intrinsic disadvantage hidden
in aggregation, if a multiple attribute system is available. Despite its numerous positive features, there are many practical
cases where the interpretation of the partial order can be rather troublesome. In these cases the analysis of underlying dimensions
could be useful to uncover particular data structures. The paper shows a way of addressing the problem with the help of an
actual case study, which deals with European opinions on services of general interest. In particular, a partial order of countries
is firstly provided and then a method to detect dimensions is discussed and applied. The analysis stems directly from the
Partially Order Set (poset) and Lattice theory with particular references to dimension theory and Formal Concept Analysis.
The study is eventually able to pinpoint role and relevance of different attributes characterizing EU countries which are
used to define the partial order.
相似文献
Rainer BrüggemannEmail: |
92.
In a recent article from the Annals of Applied Statistics, Cox discussed the main phases of applied statistical research ranging from clarifying study objectives to final data analysis and interpreting results. As an incidental remark to these main phases, we advocate that beyond cleaning and preprocessing the data, it is a good practice to audit the data to determine if they can be trusted at all. A case study based on Ghanaian Official Fishery Statistics is used to illustrate this need, with Benford's law being the tool used to carrying out the data audit. Supplementary materials for this article are available online. 相似文献
93.
Chi-Rong Li 《Journal of Statistical Computation and Simulation》2017,87(10):1940-1950
This study constructs a simultaneous confidence region for two combinations of coefficients of linear models and their ratios based on the concept of generalized pivotal quantities. Many biological studies, such as those on genetics, assessment of drug effectiveness, and health economics, are interested in a comparison of several dose groups with a placebo group and the group ratios. The Bonferroni correction and the plug-in method based on the multivariate-t distribution have been proposed for the simultaneous region estimation. However, the two methods are asymptotic procedures, and their performance in finite sample sizes has not been thoroughly investigated. Based on the concept of generalized pivotal quantity, we propose a Bonferroni correction procedure and a generalized variable (GV) procedure to construct the simultaneous confidence regions. To address a genetic concern of the dominance ratio, we conduct a simulation study to empirically investigate the probability coverage and expected length of the methods for various combinations of sample sizes and values of the dominance ratio. The simulation results demonstrate that the simultaneous confidence region based on the GV procedure provides sufficient coverage probability and reasonable expected length. Thus, it can be recommended in practice. Numerical examples using published data sets illustrate the proposed methods. 相似文献
94.
Rubin (1976) derived general conditions under which inferences that ignore missing data are valid. These conditions are sufficient but not generally necessary, and therefore may be relaxed in some special cases. We consider here the case of frequentist estimation of a conditional cdf subject to missing outcomes. We partition a set of data into outcome, conditioning, and latent variables, all of which potentially affect the probability of a missing response. We describe sufficient conditions under which a complete-case estimate of the conditional cdf of the outcome given the conditioning variable is unbiased. We use simulations on a renal transplant data set (Dienemann et al.) to illustrate the implications of these results. 相似文献
95.
96.
《Development policy review : the journal of the Overseas Development Institute》2017,35(Z2):O118-O139
Water, and Sanitation projects play an important role in alleviating water‐related poverty in developing countries. There are several methodologies that will not only assess the performance of these projects but will also help to better identify the problem and its characteristics, and to improve the efficiency of the investment. The Water Poverty Index is one of them. It is a very useful tool that helps to measure water stress at the household level in a holistic way, and to identify priorities. It is important, however, to complement it with a Cost‐Benefit Analysis that will take into account the costs of the project. A case study in Northern Colombia illustrates this point. 相似文献
97.
刘小玮 《成都理工大学学报(社会科学版)》2015,(6):14-22
网络犯罪不仅包括以网络为对象的犯罪,也包括以网络为工具的犯罪。由于网络犯罪具有犯罪主体、手段的专业化、犯罪客体的多样化、犯罪行为的隐蔽化的特点,导致犯罪行为扩散迅速、身份易藏、证据有限、毁证容易、适用法律困难等问题,对刑事侦查带来了极大的挑战。这种挑战主要体现在管辖权、证据制度和侦查措施三个方面。我国应对网络犯罪的侦查制度较为落后,应当从专门侦查机构、管辖制度、电子数据收集制度和技术侦查措施四个方面来加以完善。 相似文献
98.
《食品分析》实践教学是食品专业的一个重要的教学环节,为培养创新人才、提高学生的实验动手能力,我们在《食品分析》实验课教学中,通过从实验教学的课程体系、教学方法和手段、考核方式等方面进行了探讨,对课程实践教学改革做了一些有益的尝试和探索。 相似文献
99.
陈国宏 《福州大学学报(哲学社会科学版)》2007,21(2):32-35
以企业效益最大化为分析前提,假设企业仅面临着开展或不开展技术创新两种策略选择,并假设两种策略的收入与成本函数均为线性函数.在此基础上运用成本-效益分析法,讨论在不同情况下企业的技术创新策略选择及其判别条件,并对分析结论的经济涵义给予解释. 相似文献
100.