首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   630篇
  免费   49篇
财政金融   105篇
工业经济   38篇
计划管理   133篇
经济学   147篇
综合类   9篇
运输经济   15篇
旅游经济   12篇
贸易经济   160篇
农业经济   22篇
经济概况   35篇
邮电经济   3篇
  2023年   19篇
  2022年   3篇
  2021年   7篇
  2020年   19篇
  2019年   24篇
  2018年   29篇
  2017年   27篇
  2016年   34篇
  2015年   20篇
  2014年   24篇
  2013年   88篇
  2012年   41篇
  2011年   26篇
  2010年   26篇
  2009年   31篇
  2008年   28篇
  2007年   23篇
  2006年   18篇
  2005年   28篇
  2004年   19篇
  2003年   22篇
  2002年   12篇
  2001年   15篇
  2000年   5篇
  1999年   6篇
  1998年   11篇
  1997年   11篇
  1996年   7篇
  1995年   5篇
  1994年   5篇
  1993年   7篇
  1992年   2篇
  1991年   2篇
  1990年   1篇
  1989年   3篇
  1988年   5篇
  1987年   2篇
  1986年   3篇
  1984年   2篇
  1983年   5篇
  1982年   1篇
  1981年   3篇
  1980年   1篇
  1979年   1篇
  1978年   2篇
  1977年   1篇
  1975年   2篇
  1973年   1篇
  1971年   1篇
  1937年   1篇
排序方式: 共有679条查询结果,搜索用时 703 毫秒
101.
102.
103.
In this research paper, the definition of interviewer performance is restricted to mean the capacity of an interviewer to convince a respondent to cooperate. Furthermore, it is restricted to performance in telephone surveys. To measure this aspect of performance, researchers have until now used the cooperation rate, calculated as the number of completed interviews divided by the sum of completes plus refusals, generally retaining only the first contacts made to a given phone number in order to avoid contaminating the measure with the performance of a previous interviewer. In this paper, we argue that this measure is biased because it does not allow for the measurement of performance when interviewers, usually the best ones, work on refusal conversion or on appointments. We propose a new measure of the net contribution of interviewers to the overall cooperation rate – the Net Contribution to Performance Index (NCPI) – that measures interviewer performance irrespective of the task they perform. The properties of the index are compared with the cooperation rate at first contact using a number of criteria: reliability, variability and relationship with the overall response rate, and internal and external validity. Appendix A explains how to calculate the new index.  相似文献   
104.
105.
We explore the welfare implications of agricultural expansion in the Brazilian Amazon by comparing spatially explicit estimates of soybean rents and the value of ecosystem services. Although these estimates are generated from different datasets, models, and estimation techniques, the values are comparable, such that the value of ecosystem services is greater than soybean rents for about 61% of the total area and 24% of the area where soybean rents are positive if protected areas are well enforced. Based on the balance between the benefits and costs of conversion, failure to value ecosystem services reduces total social welfare by 7.13 billion dollars annually relative to an optimum. Policy instruments that internalize the value of ecosystem services via protected lands, land conversion taxes, conservation subsidies, or excise taxes can avoid much of this loss. Regardless of intervention regime, policy makers should be cognizant of the diminishing net benefits of converting natural ecosystems to agriculture. Realizing the final 3.8% requires the conversion of an additional 15% natural ecosystems to soybean production.  相似文献   
106.
The aim of this study is to provide a foundation for researchers and managers to discuss and resolve difficulties associated with research and development (R&D) target‐setting. While multiple studies mention the difficulty of R&D target‐setting, few have compiled reasons for these difficulties or addressed this issue in detail. This paper provides one of the first studies outlining reasons for R&D target‐setting difficulties through a literature review. It also provides an initial set of analyses and results after applying an emerging quantitative method, Technology Forecasting Using Data Envelopment Analysis (TFDEA), to illustrate these difficulties step‐by‐step to commercial airplanes. Results include determining the state of art in commercial airplane technology and technological rate‐of‐change variants in setting R&D targets.  相似文献   
107.
108.
Small Business Economics - Women are under-represented in successful entrepreneurial ecosystems and the creation of women-only entrepreneurial networks has been a widespread policy response. We...  相似文献   
109.
This paper compares the forecast performance of automatic leading indicators (ALIs) and macroeconometric structural models (MESMs) commonly used by non-academic macroeconomists. Inflation and GDP growth form the forecast objects for comparison, using data from China, Indonesia and the Philippines. ALIs are found to outperform MESMs for one-period-ahead forecasts, but this superiority disappears as the forecast horizon increases. It is also found that ALIs involve greater uncertainty in choosing indicators, mixing data frequencies and utilizing unrestricted VARs. Two ways of reducing the uncertainty are explored: (i) give theory priority in choosing indicators, and include theory-based disequilibrium shocks in the indicator sets; and (ii) reduce the VARs by means of the general-to-specific modeling procedure.  相似文献   
110.
Data driven test procedure for detection of change is introduced and its properties are studied. The new solution is max-type statistic related to data-driven rank tests for two-sample subproblems. Simulations show that the new test possesses high and stable power. The test is consistent at essentially any alternative. Asymptotic null distribution of the test is derived. The work of the first two authors has been partially supported by the grants GAČR 201/06/0186 and MSM 02160839.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号