全文获取类型
收费全文 | 40886篇 |
免费 | 545篇 |
专业分类
财政金融 | 7251篇 |
工业经济 | 2935篇 |
计划管理 | 6640篇 |
经济学 | 9107篇 |
综合类 | 712篇 |
运输经济 | 197篇 |
旅游经济 | 463篇 |
贸易经济 | 8217篇 |
农业经济 | 1189篇 |
经济概况 | 4098篇 |
信息产业经济 | 46篇 |
邮电经济 | 576篇 |
出版年
2021年 | 149篇 |
2020年 | 283篇 |
2019年 | 367篇 |
2018年 | 2694篇 |
2017年 | 2460篇 |
2016年 | 1630篇 |
2015年 | 417篇 |
2014年 | 606篇 |
2013年 | 2911篇 |
2012年 | 1118篇 |
2011年 | 2637篇 |
2010年 | 2404篇 |
2009年 | 2229篇 |
2008年 | 2168篇 |
2007年 | 2419篇 |
2006年 | 711篇 |
2005年 | 930篇 |
2004年 | 992篇 |
2003年 | 1100篇 |
2002年 | 809篇 |
2001年 | 587篇 |
2000年 | 577篇 |
1999年 | 490篇 |
1998年 | 495篇 |
1997年 | 479篇 |
1996年 | 455篇 |
1995年 | 390篇 |
1994年 | 370篇 |
1993年 | 436篇 |
1992年 | 386篇 |
1991年 | 394篇 |
1990年 | 353篇 |
1989年 | 325篇 |
1988年 | 317篇 |
1987年 | 275篇 |
1986年 | 333篇 |
1985年 | 458篇 |
1984年 | 446篇 |
1983年 | 411篇 |
1982年 | 374篇 |
1981年 | 358篇 |
1980年 | 384篇 |
1979年 | 342篇 |
1978年 | 272篇 |
1977年 | 266篇 |
1976年 | 237篇 |
1975年 | 199篇 |
1974年 | 205篇 |
1973年 | 163篇 |
1972年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Models for which the MLE and the conditional MLE coincide 总被引:1,自引:0,他引:1
The MLE, CMLE and MMLE coincide in a linear regression model with fixed individual effects. In this case, there is no incidental parameters problem and the MLE is consistent. The equivalence of these estimators is important because CMLE=MLE implies both the consistency of the MLE and the efficiency of the CMLE. In general, we cannot expect to find a CMLE or MMLE, since there may be no fixed-dimension sufficient statistic for the effects, nor an appropriate transformation of the data whose distribution does not depend on the effects. However, we show that the MLE, CMLE and MMLE do coincide in systems of seemingly unrelated regressions and in systems of simultaneous equations. We establish this result for systems in which (exogenous) variables in addition to (or other than) the intercept may have coefficients which vary over individuals, provided that the set of such variables is the same in every equation.The financial support of the National Science Foundation is gratefully acknowledged. 相似文献
42.
This paper examines occupational performance in Australia across three racial groups in Australia: Indigenous Australians; Asian people, defined as all those whose language spoken at home was either Chinese, Vietnamese or other forms of a South-east or East Asian language; and white people, defined as the residual category. The paper has as its starting point, observed differences in occupational attainment among the three groups in Australia and sets out to account for these observed differences on the basis of both race and non-racial attributes such as, age, education and area of residence. 相似文献
43.
External Sources of Innovative Capabilities: The Preferences for Strategic Alliances or Mergers and Acquisitions 总被引:2,自引:0,他引:2
This paper explores the preferences that companies have as they use alternative (quasi) external sources of innovative competencies such as strategic technology alliances, mergers and acquisitions, or a mix of these. These alternatives are studied in the context of distinct industrial, technological and international settings during the first half of the 1990s. Different strategies followed by companies and the role played by routinized sets of preferences are also taken into consideration. The analysis demonstrates that these options are influenced by both different environmental conditions and firm specific circumstances, such as those related to protecting core businesses. 相似文献
44.
45.
John Stittle 《公共资金与管理》2002,22(1):49-54
Railtrack plc, floated in 1996, was the private sector owner of Britain's railway track, signals and stations. Its major source of revenue came from track access charges, which individual train operating companies (TOCs) paid for use of the infrastructure. Since many of these TOCs received substantial subsidies to assist in paying their track access charges, Railtrack was in effect being heavily subsidised. In October 2001, the Government decided that these arrangements were no longer viable and placed Railtrack into administration. This article explains how the level of indirect subsidies to Railtrack had become excessive, and raises crucial questions that need to be addressed in settling the future shape of the railway industry. 相似文献
46.
As agricultural products move from being economic commodities to quality–differentiated goods, price dispersion within specific markets increases and implicit subsidies from high quality producers to low quality producers are removed. The present paper examines how these distributional effects can influence patterns of support and opposition to changes in marketing arrangements. The simple model developed is calibrated using data from the USA slaughter cattle market. Estimates of the impact on prices of measuring quality more accurately are found to be similar in size to previous estimates of market power price suppression in the market. 相似文献
47.
Dieter Joachim Ziegenhagen 《保险科学杂志》2002,91(3):259-277
At present, our society and its social security system are not prepared to cope with the challenges resulting from the continuous increase of life expectancy. The traditional concept of disease has to be modified for serving the special needs of the elderly. The optimistic compression of disease theory is an intriguing model, but lacks prove by available data. The anti-aging boom diverts the focus from the social and financial burden that will be unevitably caused by long-term care in the future. If there will not be an — up to now unforeseeable — breakthrough in research, particularly dementia will have an enormous impact on social cost which is often underestimated. 相似文献
48.
49.
Efficient Liability Rules: Complete Characterization 总被引:5,自引:0,他引:5
Received May, 18, 2000; revised version received March, 19, 2001 相似文献
50.
Some 'real' problems of 'virtual' organisation 总被引:1,自引:0,他引:1
John A. Hughes Jon O'Brien Dave Randall Mark Rouncefield & Peter Tolmie 《New Technology, Work and Employment》2001,16(1):49-64
This paper presents an ethnographic study of organisational change in a retail bank considering issues surrounding the supposed emergence of the 'virtual organisation'. It outlines emerging problems in organisational work as a consequence of the shift toward 'virtuality' and questions the explanatory value of such theoretical stances. 相似文献