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   30145篇
  免费   697篇
财政金融   5494篇
工业经济   2228篇
计划管理   5088篇
经济学   6800篇
综合类   323篇
运输经济   201篇
旅游经济   504篇
贸易经济   4673篇
农业经济   1501篇
经济概况   3958篇
邮电经济   72篇
  2021年   171篇
  2020年   288篇
  2019年   388篇
  2018年   551篇
  2017年   554篇
  2016年   527篇
  2015年   386篇
  2014年   604篇
  2013年   2931篇
  2012年   796篇
  2011年   879篇
  2010年   703篇
  2009年   839篇
  2008年   881篇
  2007年   799篇
  2006年   747篇
  2005年   689篇
  2004年   699篇
  2003年   682篇
  2002年   631篇
  2001年   633篇
  2000年   626篇
  1999年   553篇
  1998年   550篇
  1997年   518篇
  1996年   530篇
  1995年   464篇
  1994年   507篇
  1993年   529篇
  1992年   485篇
  1991年   515篇
  1990年   466篇
  1989年   393篇
  1988年   398篇
  1987年   393篇
  1986年   406篇
  1985年   585篇
  1984年   553篇
  1983年   558篇
  1982年   533篇
  1981年   452篇
  1980年   451篇
  1979年   455篇
  1978年   394篇
  1977年   360篇
  1976年   279篇
  1975年   276篇
  1974年   256篇
  1973年   242篇
  1972年   200篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Forecast improvement is often approached by attempting to find the “best” model for a given situation. Less attention has been paid to the possibility of examining past prediction errors for patterns that may suggest forecast adjustments for the future. This empirical study involves one firm’s management judgment forecasts for product sales and the attempts made to improve their accuracy by removing certain types of bias. In three of the five series examined, error reduction averaging close to thirty percent occurs as a result of the adjustment procedure. The other two series proved to be relatively free from bias and were therefore not in need of the correction method described.  相似文献   
92.
93.
94.
95.
Social marketing involves influencing voluntary behaviour of people towards a social end. Examples of social marketing range from campaigns to encourage healthy physical behaviour to efforts to encourage tax support for public education, overcome racism, or stimulate ‘patriotic’ behaviour. Using data from a summer 2001 telephone survey of 600 young adults, this paper investigates how recruitment campaigns may benefit from considering gender differences in importance ratings of a variety of benefits promoted by the military in the USA. Importance ratings are assessed using differences in means and variances tests. Findings identify gender specific differences that may be used to enhance recruitment campaigns. Copyright © 2004 Henry Stewart Publications  相似文献   
96.
We examine the costs and benefits of the global integrationof initial public offering (IPO) markets associated with thediffusion of U.S. underwriting methods in the 1990s. Bookbuildingis becoming increasingly popular outside the United States andtypically costs twice as much as a fixed-price offer. However,on its own, bookbuilding only leads to lower underpricing whenconducted by U.S. banks and/or targeted at U.S. investors. Formost issuers, the gains associated with lower underpricing outweighedthe additional costs associated with hiring U.S. banks or marketingin the United States. This suggests a quality/price trade-offcontrasting with the findings of Chen and Ritter, particularlysince non-U.S. issuers raising US$20 million–US$80 millionalso typically pay a 7% spread when U.S. banks and investorsare involved.  相似文献   
97.
The paper asks the question – as time series analysis moves from consideration of conditional mean values and variances to unconditional distributions, do some of the familiar concepts devised for the first two moments continue to be helpful in the more general area? Most seem to generalize fairly easy, such as the concepts of breaks, seasonality, trends and regime switching. Forecasting is more difficult, as forecasts become distributions, as do forecast errors. Persistence can be defined and also common factors by using the idea of a copula. Aggregation is more difficult but causality and controllability can be defined. The study of the time series of quantiles becomes more relevant.  相似文献   
98.
Two of the main forces driving European emigration in the late nineteenth century were real wage gaps between sending and receiving regions and demographic booms in the low‐wage sending regions. Our new estimates of net migration for the countries of sub‐Saharan Africa show that exactly the same forces driving African across‐border migration are at work today. The results suggest that rapid growth in the cohort of potential young emigrants, population pressure on the resource base, and slow economic growth are likely to intensify the pressure for migration out of Africa and into high‐wage OECD countries over the next two decades.  相似文献   
99.
100.
This study examined firm performance in market reaction to two types of business portfolio restructuring announcements: refocusing and repositioning. We predicted that market performance effects for these two types of strategic restructurers would be moderated by prior diversification posture. The theory behind these expectations was built on a general premise that restructuring strategy would be more favorably viewed by the market as performance enhancing when it offered greater potential for organizational transformation. Results showed strong support for our conclusion that prior diversification posture poses a significant contingency factor in restructuring firms' strategic choices. Further, the market tended to respond more favorably with this sample to repositioning restructuring choices. Copyright © 2003 John Wiley & Sons, Ltd.  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