全文获取类型
收费全文 | 14068篇 |
免费 | 365篇 |
专业分类
财政金融 | 2971篇 |
工业经济 | 1065篇 |
计划管理 | 2257篇 |
经济学 | 3019篇 |
综合类 | 152篇 |
运输经济 | 100篇 |
旅游经济 | 222篇 |
贸易经济 | 2251篇 |
农业经济 | 619篇 |
经济概况 | 1763篇 |
信息产业经济 | 2篇 |
邮电经济 | 12篇 |
出版年
2023年 | 73篇 |
2021年 | 84篇 |
2020年 | 192篇 |
2019年 | 252篇 |
2018年 | 335篇 |
2017年 | 332篇 |
2016年 | 307篇 |
2015年 | 203篇 |
2014年 | 326篇 |
2013年 | 1587篇 |
2012年 | 382篇 |
2011年 | 465篇 |
2010年 | 423篇 |
2009年 | 437篇 |
2008年 | 401篇 |
2007年 | 355篇 |
2006年 | 332篇 |
2005年 | 260篇 |
2004年 | 269篇 |
2003年 | 271篇 |
2002年 | 271篇 |
2001年 | 276篇 |
2000年 | 290篇 |
1999年 | 292篇 |
1998年 | 299篇 |
1997年 | 263篇 |
1996年 | 223篇 |
1995年 | 219篇 |
1994年 | 235篇 |
1993年 | 239篇 |
1992年 | 262篇 |
1991年 | 253篇 |
1990年 | 201篇 |
1989年 | 181篇 |
1988年 | 165篇 |
1987年 | 162篇 |
1986年 | 167篇 |
1985年 | 237篇 |
1984年 | 253篇 |
1983年 | 244篇 |
1982年 | 211篇 |
1981年 | 194篇 |
1980年 | 168篇 |
1979年 | 167篇 |
1978年 | 156篇 |
1977年 | 133篇 |
1976年 | 123篇 |
1975年 | 139篇 |
1974年 | 99篇 |
1973年 | 100篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
A bilinear multivariate errors-in-variables model is considered. It corresponds to an overdetermined set of linear equations
AXB=C, A∈ℝm×n, B∈ℝp×q, in which the data A, B, C are perturbed by errors. The total least squares estimator is inconsistent in this case.
An adjusted least squares estimator is constructed, which converges to the true value X, as m →∞, q →∞. A small sample modification of the estimator is presented,
which is more stable for small m and q and is asymptotically equivalent to the adjusted least squares estimator. The theoretical
results are confirmed by a simulation study.
Acknowledgements. We thank two anonymous reviewers for their suggestions and corrections.? A. Kukush is supported by a postdoctoral research
fellowship of the Belgian office for Scientific, Technical and Cultural Affairs, promoting Scientific and Technical Collaboration
with Central and Eastern Europe.? S. Van Huffel is a full professor with the Katholieke Universiteit Leuven.? I. Markovsky
is a research assistant with the Katholieke Universiteit Leuven.? This paper presents research results of the Belgian Programme
on Interuniversity Poles of Attraction (IUAP V-22), initiated by the Belgian State, Prime Minister's Office – Federal Office
for Scientific, Technical and Cultural Affairs of the Concerted Research Action (GOA) projects of the Flemish Government MEFISTO-666
(Mathematical Engineering for Information and Communication Systems Technology), of the IDO/99/03 project (K.U. Leuven) “Predictive
computer models for medical classification problems using patient data and expert knowledge”, of the FWO projects G.0078.01,
G.0200.00, and G0.0270.02.? The scientific responsibility is assumed by its authors. 相似文献
72.
Upinder S. Dhillon Dennis J. Lasser Gabriel G. Ramírez 《Review of Quantitative Finance and Accounting》1992,2(2):205-213
This study examines the effect of initiating discount and no discount dividend reinvestment plans on shareholder wealth. The results show a negative response to DRP announcements, which is significantly smaller than that found in studies of new equity offerings. These results are consistent with the Scholes and Wolfson (1989) hypothesis that managers in need of equity capital use DRPs to mitigate the adverse stock price effects of new equity issue announcements. Furthermore, there is a significant difference in the price response of discount and no discount DRPs for industrial firms. This result is supportive of the signaling potential of discount DRPs. Supportive evidence is also found in the analysis of firm characteristics for industrial firms. 相似文献
73.
Björn S. Stefansson 《Quality and Quantity》1991,25(4):389-392
Borda's vote method was used by the French Academy from 1796 to 1803 when Napoleon got it abolished. In the laws and regulations
of the Academy there are stipulations regarding the election of new members. The practice is demonstrated by some examples
from the protocols.
In fact, Borda presented two vote methods which he showed would give the same conclusion. The method which has not been in
the limelight proves to be the same one as is used for selecting the best player in chess tournaments. 相似文献
74.
Jayatilleke S. Bandara 《Journal of economic surveys》1991,5(1):3-69
Abstract. The use of CGE models has gained much popularity among policy analysts in LDCs and there is a fast growing body of literature on this area of economics. In this survey, the advantages of general equilibrium approach over partial equilibrium approach in analysing a wide range of policy issues are highlighted. The evolution of CGE modelling is discussed and more than 60 CGE applications related to different policy issues in LDCs are surveyed. This comprehensive survey shows that the CGE models have become quite popular analytical tools among policy analysts in LDCs over the last decade or so. The debate in the economic profession regarding the value and appropriateness of using CGE models for policy analysis is examined in the final section of this paper. Some of the criticisms levelled at CGE models are discussed and it is argued that despite this criticism such models are capable of providing insight into important policy problems. 相似文献
75.
C S van der Waal 《Development Southern Africa》1994,11(3):429-436
In One destiny: Our common future in Africa the author relates, in popular fashion, a series of incidents which convinced him that the basic difference between black and white in South Africa is cultural deep‐seated and the cause of underdevelopment and conflict He develops a circular argument in which world‐view is taken as the root of perceptions, values and activities. The effects of experience and economic and political factors are given secondary importance. This argument cannot accommodate social change and differentiation, and the author tends to concentrate on perceptions and events which he finds morally unacceptable. He gives an unbalanced assessment and an ethnocentric interpretation of African life. Possible reasons for this type of argument are explored and an alternative which takes its departure from the interaction between experience and perception is offered 相似文献
76.
The paper hypothesizes that diversification by firms based in the pharmaceutical industry during the 1977-86 time period was primarily undertaken to reduce the risks associated with being dependent upon a technologically dynamic environment. Consistent with this non-efficiency motive for diversification, declining economic performance is predicted. A longitudinal empirical analysis provides support for these propositions. 相似文献
77.
Swamy P.A.V.B. Tavlas George S. Lutton Thomas J. 《Journal of Productivity Analysis》2003,20(1):97-114
This paper introduces a simple, yet rich, measure of efficiency changes based on the revenue-generating-ability (RGA) principle. Using this principle, we explain the connections between efficiency changes and the variables, such as pretax profits, interest expense, non-interest expense, profit margins, loan loss provision, and asset quality. These connections are used to explain earnings differences between small and large commercial banks. 相似文献
78.
This study examines the long memory behavior in gold returns during the post-Bretton Woods period using a new rescaled range technique. Unlike the conventional rescaled range analysis, the new rescaled range analysis is robust to short-term dependence and conditional heteroscedasticity found in the gold data. Statistical results suggest that the long memory behavior in gold returns is rather unstable. When only few observations corresponding to major political events in the Middle East, together with the Hunts event, in late 1979 are omitted, little evidence of long memory can be found. 相似文献
79.
This study shows that firms in the pharmaceutical industry experience decreasing returns to scale in R & D as the level of R & D expenditures rises. The paper presents the results of our study of the innovative output of 16 pharmaceutical firms over a 19 year period. Given the strong correlation between R & D budgets and firm size, our study suggests the wave of mergers in the industry may yield less innovative productivity than managers expect. 相似文献
80.
Received March 5, 2001; revised version received August 5, 2002
Published online: April 30, 2003 相似文献