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   26595篇
  免费   701篇
  国内免费   36篇
财政金融   3784篇
工业经济   1452篇
计划管理   4057篇
经济学   7890篇
综合类   988篇
运输经济   667篇
旅游经济   684篇
贸易经济   3214篇
农业经济   1725篇
经济概况   2868篇
信息产业经济   3篇
  2025年   27篇
  2024年   272篇
  2023年   1083篇
  2022年   907篇
  2021年   967篇
  2020年   1612篇
  2019年   830篇
  2018年   699篇
  2017年   1496篇
  2016年   1537篇
  2015年   1233篇
  2014年   1878篇
  2013年   2121篇
  2012年   1481篇
  2011年   1286篇
  2010年   1235篇
  2009年   1204篇
  2008年   938篇
  2007年   952篇
  2006年   1008篇
  2005年   549篇
  2004年   355篇
  2003年   364篇
  2002年   396篇
  2001年   374篇
  2000年   267篇
  1999年   352篇
  1998年   121篇
  1997年   108篇
  1996年   117篇
  1995年   96篇
  1994年   92篇
  1993年   74篇
  1992年   46篇
  1991年   58篇
  1990年   43篇
  1989年   32篇
  1988年   127篇
  1987年   236篇
  1986年   307篇
  1985年   59篇
  1984年   52篇
  1983年   41篇
  1982年   47篇
  1981年   18篇
  1977年   24篇
  1976年   19篇
  1975年   18篇
  1973年   20篇
  1972年   22篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
In the present paper a comprehensive assessment of existing mutual fund performance models is presented. Using a survivor‐bias free database of all US mutual funds, we explore the added value of introducing extra variables such as size, book‐to‐market, momentum and a bond index. In addition to that we evaluate the use of introducing time‐variation in betas and alpha. The search for the most suitable model to measure mutual fund performance will be addressed along two lines. First, we are interested in the statistical significance of adding more factors to the single factor model. Second, we focus on the economic importance of more elaborate model specifications. The added value of the present study lies both in the step‐wise process of identifying relevant factors, and the use of a rich US mutual fund database that was recently released by the Center for Research in Security Prices.  相似文献   
2.
In this paper we attempt to describe both the data sources and organizational methods that allow for effective and easily created SAMs and regional computable general equilibrium (CGE) models. Small cities of around 100,000 people will face very different constraints than a town of 2000 people. Unfortunately, most CGE models typically describe relatively large geographical areas and are therefore not able to capture the uniqueness of individual cities within the region. An illustrative example using these methods demonstrates that the economic impacts vary substantially over different municipalities to the same economic shock.  相似文献   
3.
This article analyzes the World Bank's experience with projectevaluation for a sample of 1,015 projects by comparing estimatedrates of return at appraisal with reestimated rates of returnwhen construction works are completed, usually 5 to 10 yearsafter appraisal. The analysis highlights the high degree ofuncertainty in project analysis. A wide range of variables hasbeen introduced to explain the observed divergence in appraisaland reestimated rates of return, but only a relatively smallpart of the divergence can be explained, even with the benefitof hindsight. Project analysis thus has to cope with a largedegree of uncertainty, which the traditional methods of projectevaluation and selection have not been able to reduce.  相似文献   
4.
5.
This paper uses data from the 1991 sweep of the National Child Development Study (NCDS) and the 1998 Labour Force Survey (LFS) to provide a comprehensive analysis of the labour market returns to academic and vocational qualifications. The results show that the wage premia from academic qualifications are typically higher than from vocational qualifications. However, this gap is reduced somewhat, when we control for the amount of time taken to acquire different qualifications. This is particularly important for vocational courses, which generally take shorter time periods to complete. In the paper we also investigate how returns vary by gender, subsequent qualifications, and the natural ability of individuals. Finally, by comparing the NCDS results with those from the LFS, we estimate the bias that can result from not controlling for factors such as ability, family background and measurement error. The results reveal that the estimated returns in the NCDS equations controlling for ability, family background and measurement error are similar to the simple OLS estimates obtained with the LFS, which do not control for these factors. This suggests that the biases generally offset one another.  相似文献   
6.
This paper models the precautionary motive for a firm's cash holdings. A two-period investment model shows that the cash holdings of financially constrained firms are sensitive to cash flow volatility because financial constraints create an intertemporal trade-off between current and future investments. When future cash flow risk cannot be fully diversifiable, this intertemporal trade-off gives constrained firms the incentives of precautionary savings: they increase their cash holdings in response to increases in cash flow volatility. However, there is no systematic relationship between cash holdings and cash flow volatility for unconstrained firms. We test the empirical implications of our theory using quarterly information from a sample of U.S. publicly traded companies from 1997 to 2002, and find that the empirical evidence supports our theory.  相似文献   
7.
Impact factors     
In this paper we discuss sensitivity of forecasts with respect to the information set considered in prediction; a sensitivity measure called impact factor, IF, is defined. This notion is specialized to the case of VAR processes integrated of order 0, 1 and 2. For stationary VARs this measure corresponds to the sum of the impulse response coefficients. For integrated VAR systems, the IF has a direct interpretation in terms of long-run forecasts. Various applications of this concept are reviewed; they include questions of policy effectiveness and of forecast uncertainty due to data revisions. A unified approach to inference on the IF is given, showing under what circumstances standard asymptotic inference can be conducted also in systems integrated of order 1 and 2. It is shown how the results reported here can be used to calculate similar sensitivity measures for models with a simultaneity structure.  相似文献   
8.
9.
Changing monetary transmission mechanisms within the EU   总被引:1,自引:0,他引:1  
The paper presents a comparative analysis of monetary transmission mechanisms and changes in them after the secondERM in March 1983. The empirical model investigates the determination of money, income, prices, and interest rates in Germany, Denmark, and Italy based on the cointegratedVAR model. It provides empirical results on the macroeconomic effects of joining theERM and financial deregulation.  相似文献   
10.
    
《Journal of Retailing》2015,91(4):P1-P5
  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