全文获取类型
收费全文 | 17834篇 |
免费 | 471篇 |
国内免费 | 13篇 |
专业分类
财政金融 | 2872篇 |
工业经济 | 1179篇 |
计划管理 | 3136篇 |
经济学 | 4314篇 |
综合类 | 331篇 |
运输经济 | 196篇 |
旅游经济 | 368篇 |
贸易经济 | 3361篇 |
农业经济 | 875篇 |
经济概况 | 1662篇 |
邮电经济 | 24篇 |
出版年
2023年 | 106篇 |
2022年 | 115篇 |
2021年 | 169篇 |
2020年 | 295篇 |
2019年 | 420篇 |
2018年 | 595篇 |
2017年 | 635篇 |
2016年 | 578篇 |
2015年 | 356篇 |
2014年 | 530篇 |
2013年 | 2028篇 |
2012年 | 578篇 |
2011年 | 592篇 |
2010年 | 572篇 |
2009年 | 555篇 |
2008年 | 592篇 |
2007年 | 523篇 |
2006年 | 432篇 |
2005年 | 430篇 |
2004年 | 354篇 |
2003年 | 362篇 |
2002年 | 338篇 |
2001年 | 318篇 |
2000年 | 307篇 |
1999年 | 275篇 |
1998年 | 292篇 |
1997年 | 280篇 |
1996年 | 275篇 |
1995年 | 254篇 |
1994年 | 237篇 |
1993年 | 258篇 |
1992年 | 245篇 |
1991年 | 240篇 |
1990年 | 215篇 |
1989年 | 190篇 |
1988年 | 147篇 |
1987年 | 180篇 |
1986年 | 180篇 |
1985年 | 266篇 |
1984年 | 276篇 |
1983年 | 269篇 |
1982年 | 235篇 |
1981年 | 238篇 |
1980年 | 204篇 |
1979年 | 211篇 |
1978年 | 158篇 |
1977年 | 160篇 |
1976年 | 140篇 |
1975年 | 109篇 |
1974年 | 108篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Tamás Rudas 《Quality and Quantity》1991,25(4):345-358
The present paper considers some new models for the analysis of multidimensional contigency tables. Although the theoretical background used here appeared already in Haberman (1974), prescribed conditional interaction (PCIN) models were introduced by Rudas (1987) and their mathematical properties were worked out by Leimer and Rudas (1988). These models are defined by prescribing the values of certain conditional interactions in the contingency table. Conditional interaction is defined here as the logarithm of an appropriately defined conditional odds ratio. This conditional odds ratio is a conditional version of a generalization of the well known odds ratio of a 2×2 table and that of the three factor interaction term of a 2×2×2 table and applies to any number of dimensions and any number of categories of the variables. The well known log-linear (LL) models are special PCIN models. Estimated frequencies under PCIN models and tests of fit can be computed using existing statistical software (e.g. BMDP). The paper describes the class of PCIN models and compares it to the class of association models of Goodman (1981). As LL models are widely used in the analysis of social mobility tables, application of more general PCIN models is illustrated. 相似文献
92.
93.
94.
Robert L. Kahn 《人力资源管理》1984,23(1):5-22
Present patterns of productive activity are neither well recognized, optimal for society, nor in accordance with individual prefence. Although a great deal of attention has been given to meeting people's needs for income, medical care, and other services, the quality of their lives must also be defined by what they do for themselves and for others. In discovering present patterns of productive activity throughout the life course and optimizing those patterns, we will raise the quality of American life. To accomplish this task, two great changes are needed: we must recognize the full range of productive activities throughout the life course and give people the opportunity to modify the allocation of paid employment. 相似文献
95.
96.
Christopher L. Gilbert 《Journal of econometrics》1977,5(2):221-239
By consideration of either Generalised Least-Squares of Theil-Goldberger estimates of equations for which data on the dependent variable is available for a subset of the sample period on only an annual basis, it is shown that best estimates of the equation coefficients may be obtained by Ordinary Least-Squares estimation over the complete set of quarterly observations with quarterly averages substituted for the missing quarterly data, and symmetrically for the corresponding observations on the regressor variables. The approach is extended to the Two-Stage Least-Squares case, and to the (structurally or stochastically) autoregressive case. 相似文献
97.
98.
L.D. McClements 《Journal of public economics》1979,12(2):233-242
99.
100.
This study is concerned with one aspect of the family cycle, namely, the transition from young married to young married with small children. The focus is on developing models to forecast entries into this latter stage for the purpose of marketing research. "Using ordinary least squares, forecasting models were estimated for (1) total number of first births, (2) number of white first births, and (3) number of nonwhite first births." Models are estimated for both the United States and California using data from official sources. 相似文献