全文获取类型
收费全文 | 1772篇 |
免费 | 54篇 |
专业分类
管理学 | 243篇 |
民族学 | 7篇 |
人才学 | 8篇 |
人口学 | 130篇 |
丛书文集 | 10篇 |
理论方法论 | 203篇 |
综合类 | 16篇 |
社会学 | 1021篇 |
统计学 | 188篇 |
出版年
2022年 | 14篇 |
2021年 | 14篇 |
2020年 | 28篇 |
2019年 | 30篇 |
2018年 | 41篇 |
2017年 | 52篇 |
2016年 | 45篇 |
2015年 | 35篇 |
2014年 | 50篇 |
2013年 | 284篇 |
2012年 | 71篇 |
2011年 | 69篇 |
2010年 | 55篇 |
2009年 | 52篇 |
2008年 | 70篇 |
2007年 | 64篇 |
2006年 | 60篇 |
2005年 | 43篇 |
2004年 | 56篇 |
2003年 | 35篇 |
2002年 | 48篇 |
2001年 | 31篇 |
2000年 | 36篇 |
1999年 | 40篇 |
1998年 | 45篇 |
1997年 | 18篇 |
1996年 | 30篇 |
1995年 | 20篇 |
1994年 | 22篇 |
1993年 | 26篇 |
1992年 | 30篇 |
1991年 | 24篇 |
1990年 | 19篇 |
1989年 | 16篇 |
1988年 | 17篇 |
1987年 | 19篇 |
1986年 | 14篇 |
1985年 | 18篇 |
1984年 | 13篇 |
1983年 | 17篇 |
1982年 | 18篇 |
1981年 | 27篇 |
1980年 | 18篇 |
1979年 | 13篇 |
1978年 | 7篇 |
1977年 | 7篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1973年 | 6篇 |
1972年 | 6篇 |
排序方式: 共有1826条查询结果,搜索用时 343 毫秒
11.
We show that Bayesian ex post aggregation is unstable with respect to refinements. Suppose a group of Bayesians use ex post
aggregation. Since it is a joint problem, each agent's problem is captured by the same model, but probabilities and utilities
may vary. If they analyze the same situation in more detail, their refined analysis should preserve their preferences among
acts. However, ex post aggregation could bring about a preference reversal on the group level. Ex post aggregation thus depends
on how much information is used and may keep oscillating (“flipping”) as one keeps adding more information.
Received: 16 April 2002/Accepted: 27 May 2002 相似文献
12.
Employer use of employee drugscreening procedures is widespread in the U.S. A state-by-state analysis of statutory law applicable
to the drug testing issue is combined with state and industry data to isolate how drug testing laws affect workplace injury
rates. Based on our data, injury rates are not statistically related to the state’s legal environment. 相似文献
13.
14.
15.
Terrorist actions are aimed at maximizing harm (health, psychological, economical, and political) through the combined physical impacts of the act and fear. Immediate and effective response to a terrorist act is critical to limit human and environmental harm, effectively restore facility function, and maintain public confidence. Though there have been terrorist attacks in public facilities that we have learned from, overall our experiences in restoration of public facilities following a terrorist attack are limited. Restoration of public facilities following a release of a hazardous material is inherently far more complex than in industrial settings and has many unique technical, economic, social, and political challenges. For example, there may be a great need to quickly restore the facility to full operation and allow public access even though it was not designed for easy or rapid restoration, and critical information is needed for quantitative risk assessment and effective restoration must be anticipated to be incomplete and uncertain. Whereas present planning documents have substantial linearity in their organization, the “adaptive management” paradigm provides a constructive parallel paradigm for restoration of public facilities that anticipates and plans for uncertainty, inefficiencies, and stakeholder participation. Adaptive management grew out of the need to manage and restore natural resources in highly complex and changing environments with limited knowledge about causal relationships and responses to restoration actions. Similarities between natural resource management and restoration of a public facility after a terrorist attack suggest that integration of adaptive management principles explicitly into restoration processes will result in substantially enhanced and flexible responses necessary to meet the uncertainties of potential terrorist attacks. 相似文献
16.
The authors provide an overview of optimal scaling results for the Metropolis algorithm with Gaussian proposal distribution. They address in more depth the case of high‐dimensional target distributions formed of independent, but not identically distributed components. They attempt to give an intuitive explanation as to why the well‐known optimal acceptance rate of 0.234 is not always suitable. They show how to find the asymptotically optimal acceptance rate when needed, and they explain why it is sometimes necessary to turn to inhomogeneous proposal distributions. Their results are illustrated with a simple example. 相似文献
17.
18.
Jeffrey Parker 《Economic inquiry》1992,30(1):101-116
The effects of sectoral shifts, measured by dispersion in the growth rates of employment or earning across industries or regions, on unemployment are tested in a specification controlling for the effects of other labor-market variables and shifts in the demographic composition of the labor force. Interindustry and geographical shifts in labor demand have significant unemployment effects, with adult males the group most strongly affected. The estimated equations imply that most of the fluctuation in unemployment over the period 1956-87 was been due to microeconomic causes rather than aggregate demand. 相似文献
19.
Unions,PAC contributions,and the NAFTA vote 总被引:1,自引:0,他引:1
Political action committees (PACs), especially those controlled by organized labor and business, have been shown to affect
Congressional voting. We explore how PACs influenced the House of Representatives’ vote on the North American Free Trade Agreement
(NAFTA). The NAFTA vote is analyzed because organized labor strongly opposed the treaty while business generally supported
it and because of the straight-forward voting generated by its fast-track status. Probit analysis of a unique, unpublished
data set containing information about PAC and non-PAC contributions to the 1992 House election campaigns demonstrates that
Representatives who depended largely on labor PACs tended to oppose NAFTA, while Representatives who derived a large proportion
of their campaign contributions from business PACs tended to favor its passage. 相似文献
20.
Are the decisions of American policymakers informed by generaltrends in the publics ideology or by the publicspolicy-specific preferences? In this article we discuss twoexplanations for the types of public opinion information thatpoliticians collect and use. Using a unique data set of privatepolls from the White House of Richard Nixon, we find that whenopinion data on specific policies were available, the presidentrelied on them and not on general ideology data. On less importantissues, however, we find that the president often chose notto collect policy-specific data and instead relied on generalideology data. The differential collection and use of informationby policymakers reflect varying strategic calculations. Theyalso have profound implications for representative democracyand the demands placed on citizens and governors. 相似文献