全文获取类型
收费全文 | 21206篇 |
免费 | 425篇 |
专业分类
财政金融 | 4013篇 |
工业经济 | 1772篇 |
计划管理 | 3453篇 |
经济学 | 4612篇 |
综合类 | 283篇 |
运输经济 | 136篇 |
旅游经济 | 295篇 |
贸易经济 | 3227篇 |
农业经济 | 1138篇 |
经济概况 | 2666篇 |
信息产业经济 | 3篇 |
邮电经济 | 33篇 |
出版年
2020年 | 218篇 |
2019年 | 323篇 |
2018年 | 375篇 |
2017年 | 403篇 |
2016年 | 390篇 |
2015年 | 254篇 |
2014年 | 366篇 |
2013年 | 2020篇 |
2012年 | 532篇 |
2011年 | 620篇 |
2010年 | 540篇 |
2009年 | 627篇 |
2008年 | 575篇 |
2007年 | 496篇 |
2006年 | 471篇 |
2005年 | 464篇 |
2004年 | 403篇 |
2003年 | 436篇 |
2002年 | 402篇 |
2001年 | 420篇 |
2000年 | 443篇 |
1999年 | 418篇 |
1998年 | 419篇 |
1997年 | 411篇 |
1996年 | 443篇 |
1995年 | 381篇 |
1994年 | 362篇 |
1993年 | 344篇 |
1992年 | 384篇 |
1991年 | 394篇 |
1990年 | 364篇 |
1989年 | 275篇 |
1988年 | 270篇 |
1987年 | 241篇 |
1986年 | 301篇 |
1985年 | 423篇 |
1984年 | 387篇 |
1983年 | 370篇 |
1982年 | 324篇 |
1981年 | 348篇 |
1980年 | 296篇 |
1979年 | 322篇 |
1978年 | 297篇 |
1977年 | 219篇 |
1976年 | 210篇 |
1975年 | 195篇 |
1974年 | 186篇 |
1973年 | 163篇 |
1972年 | 151篇 |
1971年 | 132篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
T.S.K. Moothathu 《Statistica Neerlandica》1987,41(4):253-256
The case is investigated when Hoeffding's one sample U–statistic theorem for the sample variance S2 is not applicable. It is shown that this occurs only when the parent distribution is the two–point distribution with jumps of equal magnitude. For this exceptional case the standardised S2 is shown to converge in distribution to (1 – V )√2, where V has chi–square distribution with one degree of freedom. 相似文献
122.
In our earlier paper [Srivastava, Agnihotri and Dwivedi (1980)] the dominance of double k-class over k-class with respect to exact mean squared error matrix criteria is established. It is observed that given a member of k-class, one can pick up a member of double k-class that will provide an improved estimator of the coefficients. This result prompted us to study the exact finite sample properties of the double k-class estimator. For this, we have considered a structural equation containing two endogenous variables and have investigated the properties of double k-class estimators of the coefficients of explanatory endogenous variables assuming characterizing scalars to be non-stochastic. 相似文献
123.
Charles W. Baird 《Managerial and Decision Economics》1981,2(2):82-90
It is incorrect and misleading to speak of unionization as a ‘human right’. The only human right is ‘self-ownership’, i.e. to pursue goals with one's own abilities but with no force or fraud against others. Government cannot dispense rights, only privileges and protections to some at the expense of others. A minimal degree of coercion exercised by government is unavoidable. But labor unions are not governments. Government has granted significant privileges to unions in the private sector, but such are not appropriate for public sector unions. 相似文献
124.
Entropy concepts have developed in four general contexts—thermodynamics, communication theory, statistical information theory and social and life sciences. These concepts have five distinct mathematical forms. Ambiguity and complexity in utilization of the concept has been heightened by this multi-faceted heritage. Effective utilization may be strengthened by a sharper articulation of entropy through combinations of literal, mathematical and graphical modes of expression. Geography and planning as user disciplines have important responsibilities in enhancing cross-disciplinary communication of this important adisciplinary concept. Implications of these arguments for the social sciences include the need for caution in drawing social analogies from the ambiguous entropy concepts of statistical mechanics; and an indication of the potential benefits of social science models based on the unambiguous entropic constructs of statistical information theory. 相似文献
125.
We present general results for finding or boundingt
maxB
, the maximum number of arbitrary whole blocks of observations which can be removed from a block design, and still leave all of the elementary treatment contrasts estimable. The block sizes may be larger than the number of treatments. The results are applied to BBDs, reinforced BIBDs and BBDs, BTIBDs, and a series of variance balanced incomplete block designs with two block sizes. Also given for most of these designs, are results fort
max, the maximum number of arbitrary, scattered observations that can become unavailable, and still leave all of the elementary treatment contrasts estimable.The work was undertaken while Dr. Whittinghill was visiting Ohio State University, and supported by a grant from the Natural Sciences Division, Colby College, Waterville, Maine. 相似文献
126.
South Korea is a remarkable macroeconomic success story, but it has performed relatively poorly in one respect: the provision of high quality housing at reasonable prices. This paper analyzes the Korean housing market and the market for related inputs, with special emphasis on the regulatory environment. 相似文献
127.
The problem of comparing the precisions of two instruments using repeated measurements can be cast as an extension of the Pitman-Morgan problem of testing equality of variances of a bivariate normal distribution. Hawkins (1981) decomposes the hypothesis of equal variances in this model into two subhypotheses for which simple tests exist. For the overall hypothesis he proposes to combine the tests of the subhypotheses using Fisher's method and empirically compares the component tests and their combination with the likelihood ratio test. In this paper an attempt is made to resolve some discrepancies and puzzling conclusions in Hawkins's study and to propose simple modifications.
The new tests are compared to the tests discussed by Hawkins and to each other both in terms of the finite sample power (estimated by Monte Carlo simulation) and theoretically in terms of asymptotic relative efficiencies. 相似文献
The new tests are compared to the tests discussed by Hawkins and to each other both in terms of the finite sample power (estimated by Monte Carlo simulation) and theoretically in terms of asymptotic relative efficiencies. 相似文献
128.
129.
130.
Jan K. Brueckner 《Journal of urban economics》1983,13(2):216-234
A theoretical housing model is developed embodying the approach of the recent hedonic price literature. Instead of focusing on a scalar “housing service” consumption measure, the model portrays housing as a commodity with two attributes: floor space and yard space. Developers react to a consumer bid-rent function, which relates dwelling rent to floor space, yard space, and location, in choosing the profit-maximizing characteristics of their housing complexes. The spatial behavior of the developer's choice variables is investigated (an interesting question is whether yards are larger farther from the urban center), and a comparative static analysis of the housing market equilibrium is presented. 相似文献