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   34664篇
  免费   864篇
财政金融   6347篇
工业经济   2536篇
计划管理   6006篇
经济学   7825篇
综合类   341篇
运输经济   259篇
旅游经济   586篇
贸易经济   5451篇
农业经济   1630篇
经济概况   4448篇
邮电经济   99篇
  2021年   203篇
  2020年   350篇
  2019年   471篇
  2018年   669篇
  2017年   668篇
  2016年   648篇
  2015年   474篇
  2014年   715篇
  2013年   3419篇
  2012年   987篇
  2011年   1062篇
  2010年   883篇
  2009年   1041篇
  2008年   1042篇
  2007年   936篇
  2006年   886篇
  2005年   823篇
  2004年   816篇
  2003年   810篇
  2002年   737篇
  2001年   750篇
  2000年   733篇
  1999年   647篇
  1998年   634篇
  1997年   618篇
  1996年   620篇
  1995年   544篇
  1994年   583篇
  1993年   601篇
  1992年   559篇
  1991年   568篇
  1990年   520篇
  1989年   441篇
  1988年   445篇
  1987年   429篇
  1986年   449篇
  1985年   647篇
  1984年   613篇
  1983年   592篇
  1982年   572篇
  1981年   494篇
  1980年   501篇
  1979年   503篇
  1978年   423篇
  1977年   377篇
  1976年   310篇
  1975年   291篇
  1974年   274篇
  1973年   271篇
  1972年   214篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
31.
Lynn  Peter 《Quality and Quantity》2003,37(3):239-261
The effects of unit non-response on survey errors are of great concern to researchers.However, direct assessment of non-response bias in survey estimates is rarely possible.Attempts are often made to adjust for the effects of non-response by weighting, but thisusually relies on the use of frame data or external population data, which are at bestmodestly correlated with the survey variables. This paper reports the development ofa method to collect limited survey data from non-respondents to personal interviewsurveys and a large-scale field test of the method on the British Crime Survey (BCS).The method is shown to be acceptable and low cost, to provide valid data, and to haveno detrimental effect on the main survey. The use of the resultant data to estimatenon-response bias is illustrated and some substantive conclusions are drawn for the BCS.  相似文献   
32.
The American Psychological Association Task Force recommended that researchers always report and interpret effect sizes for quantitative data. However, no such recommendation was made for qualitative data. Thus, the first objective of the present paper is to provide a rationale for reporting and interpreting effect sizes in qualitative research. Arguments are presented that effect sizes enhance the process of verstehen/hermeneutics advocated by interpretive researchers. The second objective of this paper is to provide a typology of effect sizes in qualitative research. Examples are given illustrating various applications of effect sizes. For instance, when conducting typological analyses, qualitative analysts only identify emergent themes; yet, these themes can be quantitized to ascertain the hierarchical structure of emergent themes. The final objective is to illustrate how inferential statistics can be utilized in qualitative data analyses. This can be accomplished by treating words arising from individuals, or observations emerging from a particular setting, as sample units of data that represent the total number of words/observations existing from that sample member/context. Heuristic examples are provided to demonstrate how inferential statistics can be used to provide more complex levels of verstehen than is presently undertaken in qualitative research.  相似文献   
33.
34.
Recent advances in asset pricing—the reduced-form approach to pricing risky debt and derivatives—are used to quantitatively evaluate several proposals for mandatory bank issue of subordinated debt. We find that credit spreads on both fixed- and floating-rate subordinated debt provide relatively clean signals of bank risk and are not unduly influenced by nonrisk factors. Fixed-rate debt with a put is unacceptable, but making the putable debt floating resolves most problems. Our approach also helps to clarify several different notions of “bank risk.”  相似文献   
35.
中国现阶段的工业品市场营销模式初探   总被引:1,自引:0,他引:1  
随着中国市场经济的快速发展、科技水平的提高以及中国加入WTO,工业品的市场竞争将更加激烈。对于中国现阶段的工业品来讲,由于行业、企业、产品特点及销售对象不同,各公司的营销策略各有不同,尤其对市场营销模式需要进一步探索。  相似文献   
36.
37.
38.
In this paper we will analyze the relationship between the value and duration moments of a cash flow and movements in the yield curve. We will show that for changes in the yield curve which can be related to tn , the 1st order changes in the net present value of a cash flow are linearly dependent on the n + lth duration moments, and that the 2nd order changes are dependent on the sum of duration moments of order 2 n + 1 and 2 n + 2. We will use this relationship to tilt tracking portfolios so as to protect them against specific changes in the yield curve.  相似文献   
39.
40.
The introduction of traffic management schemes has been one response of the National Parks to the problem of ever-increasing car-borne visitors and the consequent damage caused to the rural environment. By reviewing these schemes and by determining and explaining attitudes towards one particular traffic management experiment, the paper aims to deduce lessons for future policy. The analysis, based on two visitor surveys, suggests that the likelihood of success is improved when schemes are integrated, containing both ‘carrot’ and ‘stick’ elements. Since public perceptions are also found to be pivotal to its success, appropriate marketing of a scheme is vital. The paper concludes, however, that to achieve the fundamental objective of greater accessibility with less mobility, a more wide-ranging marketing effort is required intended to engender a sea change in attitude towards both the car and public transport.  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