A comparison of treatment effects estimators using a structural model of AMI treatment choices and severity of illness information from hospital charts

We compare the performance of various matching estimators using a novel approach that is feasible in the absence of experimental data. We estimate a structural model of hospital choices and catheterization for Medicare heart attack victims using hospital chart data on patient heterogeneity. With the estimated structural parameters, we simulate data for which the treatment effect is known. We find that as measures of individual heterogeneity are added to the controls, matching estimators perform well. However, the estimators do a poor job recovering the true treatment effect when measures of individual heterogeneity are unavailable. Copyright © 2010 John Wiley & Sons, Ltd.     

全球经济形势黯淡

【美国《华尔街日报》8月15日】面对美国经济疲软的压力，数月来一直表现得很有弹性的全球经济终于开始明显放缓了。     

The Crisis Management of University and the Construction of Harmonious Campus

The University as the scientific research and the top level personnel training base,has the special position in the social development. Once this special domain groups suffer the crisis, its influence is inestimable. This article has limited the crisis management of university connotation from the crisis and crisis management＇s angle,analyzes the question of crisis management of Universities in our country. So every university should use the crisis manngement theory,with their oven characteristics,to discover a better crisis management strategy of Chinese characteristic university,in order to construct the development of harmonious campus with steady steps.     

Firms’ reactions to public information on business practices: The case of search advertising

Quantitative Marketing and Economics - We use five years of bidding data to examine the reaction of advertisers to widely disseminated press on the lack of effectiveness of brand search advertising...     

The Innovation Performance of Irish and Foreign‐owned Firms: The Roles of R&D and Networking

This paper contributes to the growing evidence that Irish and foreign‐owned firms based in Ireland conduct their innovation activities differently from each other. It tests the Cohen and Levinthal hypothesis, separately for Irish and foreign‐owned firms, that undertaking R&D and collaborating with external networks together enhance the probability of product and process innovation. To control for potential endogeneity of the external networking variables, a two‐step procedure is used with predicted probabilities used as instruments in the estimated production functions. Based on data from the Irish Community Innovation Survey 2006 to 2008, the results suggest that Irish‐owned firms which engage in external networks with public knowledge sources, while simultaneously undertaking R&D, are more likely to innovate than firms which perform these two activities individually. Irish‐owned firms which engage in backward networking for product and forward networking for process innovation while also undertaking R&D are less likely to be innovative, perhaps suggesting a substitution effect. These results for Irish‐owned firms provide some support for Cohen and Levinthal's hypothesis. However, foreign‐owned firms seem to behave differently, being largely self‐contained and relying exclusively on intramural R&D for innovation as the external networking variables, both individually and when interacted with R&D, have no effect on innovation likelihood.     

地方对外宣传物的汉译英刍议

地方对外宣传作品因具有较强地方特色,译成英文有一定的难度。译者要仔细研读原文,深入分析原文的内在涵义,用合乎英语习惯的表达方式将其译成明白易懂的英文,并尽量保持原文的文化韵味。     

The effects of the frequency of spatially proximate and distant interaction on innovation by Irish SMEs

This paper tests whether more frequent interaction at different spatial levels has a positive effect on the innovation performance of small- and medium-sized enterprises (SMEs) in the South-West and South-East of Ireland. Based on an original survey, it finds that more frequent interaction generally increases innovation likelihood, but at a diminishing rate, thus suggesting a trade-off between resources dedicated to transforming knowledge into new products and processes. Spatially distant interaction is found to be at least as valuable as proximate interaction, which questions the received wisdom that the best sources of knowledge are regional. Given the value of distant interaction, the results indicate that regional lock-in may be an obstacle to superior innovation performance of SMEs.     

Technological change and agricultural household income distribution: theory and evidence from China

This article applies a general equilibrium model to analyse the impact of new rice technology on household income and uses agricultural household survey data from China to test the implications of this model. It is shown that, when a new rice technology becomes available, the adopting household will reallocate resources to increase rice production and reduce the production of other goods. Meanwhile, the non-adopting households will do the opposite. Thus, the income from rice becomes increasingly concentrated in the adopting households and income from non-rice becomes increasingly concentrated in the non-adopting households. If only one source of income is examined, the introduction of new rice technology increases the inequality of income distribution in rural areas. But, if the total household income is examined, the distributional inequality is mitigated.     

COMPARING FEDERAL AND PRIVATE‐SECTOR WAGES WITHOUT LOGS

I use Current Population Survey data from 2005 through 2010 to compare the wages of federal employees and workers in the private sector who have similar observable characteristics. The distribution of wages differed drastically between the federal and private sectors. In particular, I find that federal employees with no more than a high school diploma earned 21% more, on average, than their private‐sector counterparts, whereas those with a professional degree or doctorate earned 23% less. Overall, the average of federal wages was about 2% higher than the average wage of similar private‐sector workers. Other researchers have found larger differences because they used log‐linearized models, which result in comparisons of geometric means. I show that arithmetic means are more relevant in the context of the relationship between a government's compensation policy and its budget. The discrepancy between differences in arithmetic and geometric means occurs because the wages of federal employees were much less dispersed than those of employees with similar characteristics in the private sector. (JEL J31, J38, J45)