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991.
Are Unrealistic Assumptions/Simplifications Acceptable? Some Methodological Issues in Economics 下载免费PDF全文
Yew‐Kwang Ng 《Pacific Economic Review》2016,21(2):180-201
Are unrealistic assumptions acceptable? If results are not changed in a misleading way, they are acceptable. The same assumption may be acceptable in one context and not in another. Assuming identical pairs of individuals in the parity and limit theorems in general equilibrium theory is acceptable as results are not changed substantially. The alleged equivalence of the first‐price and second‐price auctions is based on misleading assumptions; Coase's case against taxing pollution is based on a misleading all‐or‐nothing comparison. The contrasting results (neutrality versus non‐neutrality of money) of perfect versus imperfect competition in macroeconomics with important real‐world policy relevance are also used to illustrate the point. 相似文献
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An Empirical Comparison Between the Synthetic Control Method and HSIAO et al.'s Panel Data Approach to Program Evaluation 下载免费PDF全文
We compare two program evaluation methodologies: the synthetic control method and the panel data approach. We apply both methods to estimate the effect of the political and economic integration of Hong Kong. The results obtained differ depending on the methodology used. We then conduct a simulation that shows that the synthetic control method results in a post‐treatment mean squared error, mean absolute percentage error, and mean error with a smaller interquartile range, whenever there is a good enough match. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Gender,life cycle,and family ‘strategies’ among the poor: the Barcelona workhouse, 1762–1805 下载免费PDF全文
Poor relief has received less attention from historians of southern Europe compared with northern Europe. This article seeks to challenge the frequent assumption that the strength of family ties in southern Europe mitigated the need for welfare provision. It provides new data for men and boys entering the Barcelona workhouse in the period 1780–1803, and compares these with data from an earlier study of women and girls who entered the same institution over the period 1762–1805. We establish the characteristics of those who sought relief in terms of age, place of origin, marital status, and occupation. We use the information on reasons for entry and exit to ascertain family circumstances. We show that there were significant differences between males and females in terms of why they entered and left, and length of stay, particularly among the elderly. The bulk of the population of the workhouse, however, was comprised of children and adolescents. For this group, entry into the workhouse represented not just a temporary solution to life cycle poverty and periodic unemployment, but also a longer‐term strategy aimed at smoothing entry into the labour market. 相似文献
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Riccardo Crescenzi Andrés Rodríguez‐Pose 《International journal of urban and regional research》2017,41(6):1010-1027
The BRICS countries in general, and China and India in particular, are now widely regarded as the areas of the world likely to challenge the economic leadership of the United States (US) and the European Union (EU). A large part of this challenge will come from rapid technological catch‐up by China and India. Yet, despite a recent rise in interest, there is limited knowledge about how and where innovation takes place in these two leading emerging countries and to what extent the Chinese and Indian territorial systems of innovation differ from those in the EU or the US. In this article we explore the geography of innovation in China and India, concentrating on understanding key territorial‐level innovation trends by country, region and technology field, using the US and the EU as benchmarks. We find significant contrasts between the geography of innovation in China and India and that of the US and the EU. First, the degree of concentration of innovative activities in both countries is extremely high. Levels of agglomeration of innovation in the coastal provinces of China, as well as in Delhi and the South of India, significantly exceed the levels of agglomeration found in the USA and the EU. Secondly, China has witnessed a more rapid increase in the degree of concentration of innovation than India. We posit that the differences in the geography of innovation between, on the one hand, China and India and, on the other hand, between these countries and the developed world are rooted in different institutional settings, different systems of innovation and different national innovation strategies. 相似文献
999.
Do analysts who understand accounting conservatism exhibit better forecasting performance? 下载免费PDF全文
Jay Heon Jung Sonya S. Lim Jinhan Pae Choong‐Yuel Yoo 《Journal of Business Finance & Accounting》2017,44(7-8):953-985
This study investigates the performance of analysts when they match the asymmetric timeliness of their earnings forecast revisions (i.e., asymmetric forecast timeliness) with the asymmetric timeliness of firms’ reported earnings (i.e., asymmetric earnings timeliness). We find that better timeliness‐matching analysts produce more accurate earnings forecasts and elicit stronger market reactions to their forecast revisions. Further, better timeliness‐matching analysts issue less biased earnings forecasts, more profitable stock recommendations and have more favorable career outcomes. Overall, our results indicate that analysts’ ability to incorporate conditional conservatism into their earnings forecasts is an important reflection of analyst expertise and professional success. 相似文献
1000.
目的探讨保乳手术治疗早期老年乳腺癌的临床价值。方法将我院近期收治的早期老年乳腺癌患者150例,随机分为治疗组和对照组,各75例,治疗组患者进行保乳手术,对照组患者进行传统手术,对比分析两组患者经过手术后临床疗效,以及生活质量等。结果治疗组患者的手术中出血量、拔引流管时间、总的引流量及术后并发症显著优于对照组患者(P<0.05),同时治疗组患者经手术治疗后其生活质量高于对照组患者(P<0.05)。结论相比于传统的手术保乳手术具有手术后恢复时间短、并发症少及患者生活质量高等方面的优势,在临床治疗上可以进行大力推广。 相似文献