Allocation of resources in asymmetric competitions: How do the weak maintain a chance of winning?

To maintain a chance of occasionally beating a stronger player in a competition waged over several fields, a weaker player should give up on some of the fields and concentrate resources on the remaining ones. But when do weak players actually do this? And which fields do they give up when the fields differ in their likelihood of being assessed? We report an experimental study of resource allocation in which asymmetric pairs of players compete over asymmetric fields. Symmetric players and symmetric fields are used for control. We find that players behave as follows: (1) Average wins are the same in the symmetric and asymmetric fields conditions and correspond to relative player strength. (2) The proportion of fields given up on decreases with a player’s greater relative strength, increases for asymmetric field likelihoods, and increases when competitions are framed in meaningful context; this proportion is related to wins. (3) When field likelihoods are asymmetric, players’ resource allocation is correlated with likelihood. Wins generally increase with that correlation but the relation is different for players of different strength. (4) The proportion of fields given up on and the correlation with likelihood change with experience towards the values corresponding to higher wins.     

Revisiting retesting in the estimation of proportions by group testing

In the estimation of a proportion p by group testing (pooled testing), retesting of units within positive groups has received little attention due to the minimal gain in precision compared to testing additional units. If acquisition of additional units is impractical or too expensive, and testing is not destructive, we show that retesting can be a useful option. We propose the retesting of a random grouping of units from positive groups, and compare it with nested halving procedures suggested by others. We develop an estimator of p for our proposed method, and examine its variance properties. Using simulation we compare retesting methods across a range of group testing situations, and show that for most realistic scenarios, our method is more efficient.     

The myth of price convergence under economic integration: A proposed explanation for the difference in food prices across European countries

Conventional globalization theory states that regional economic integration will precede price standardization across participating countries due to the increased buying power of large retail groups and parallel imports. The resulting price corridor should merely reflect differences in logistic costs and short-term, local competitive actions. Yet, this study uses panel data from 25 European countries to examine how hefty food and beverage price differentials between regions remained constant over the last decade. Income, store productivity, and market concentration all contribute to the explanation for regional price differences. These findings suggest that, contrary to straight-line globalization theory, large European retailers’ decisions can influence price convergence and maintain important price dispersion between economically integrated countries. We provide recommendations to enhance market integration.     

Unemployment and men's entrance into female-dominated jobs

Despite the contraction of many male-dominated occupations, men have made limited progress in entering female-dominated jobs. Using monthly employment histories from the SIPP, we examine whether individual economic conditions—such as a period of unemployment—are associated with men subsequently pursuing female-dominated work. Specifically, we ask whether men are more likely to enter female-dominated jobs after unemployment, compared to men who take a new job directly from employment. We find that unemployment significantly increases the odds of men entering female-dominated work among men who make job transitions. By examining changes in occupational prestige as well as wage differences before and after unemployment, we also find that entering a female-dominated job (compared to other job types) may help men mitigate common scarring effects of unemployment such as wage losses and occupational prestige downgrades. Accordingly, this study reveals a critical occupational route that may allow men to remain upwardly mobile after involuntary unemployment.     

小组工作介入聋儿社会资本的重构

社会资本在聋儿成长中具有非常重要的作用。重构聋儿社会资本成为社会康复的核心内容。在聋儿听力康复过程中,由于聋儿游戏群体的缺失、家长的认识偏误以及家长社会资本的不足等原因,导致聋儿社会资本不足的问题非常突出。文章从小组工作视角出发,提出通过组建聋儿游戏群体,增进聋儿家长社会资本,重构聋儿社会资本的建议。     

中东剧变中的阿尔及利亚政局透视

2010年底以来,中东地区多国发生了政权更迭,阿尔及利亚一度爆发群众游行示威,但目前阿尔及利亚政局基本稳定,原因可归纳为以下四个方面:一是阿尔及利亚独立以来的长期动荡释放了民众的不满;二是布特弗利卡执政联盟仍具有较强的政治实力;三是国内的两个主要反对派因其各自的缺陷,难以获得大多数民众的支持;四是现政权与美国保持了较好的关系。然而,由于目前中东地区的局势尚在发展中,随着新因素的加入,阿尔及利亚的政局仍存在变数。     

Foodborne Exposure to Pesticides and Methylmercury in the United Arab Emirates

As part of a comprehensive environmental health strategic planning project initiated by the government of Abu Dhabi, we assessed potential dietary exposure in the United Arab Emirates (UAE) to methylmercury (in seafood) and pesticides (in fruits and vegetables) above international guideline levels. We present results for the UAE population by age, gender, and body mass index. Our results show very low daily risks of exposure to pesticides in fruits and vegetables at levels exceeding WHO guidelines even under the conservative assumption that no pesticides are removed during washing and food preparation. Thus, exposure to pesticides on fruits and vegetables does not appear to be a major public health concern in the UAE. The chances of exposure to methylmercury in seafood are much higher; our model estimates a mean 1 in 5 daily risk of exceeding the FAO/WHO provisional tolerable weekly intake. However, great caution should be used in interpreting these results, as we analyzed only the risks and not the substantial benefits of fish consumption. In fact, previous studies have demonstrated that exposure to the n‐3 polyunsaturated fatty acids in fish can increase IQ in developing children, and it can substantially decrease the risk in adults of coronary heart disease and stroke. Further research is warranted to compare the risk of Me‐Hg exposure from fish to the nutritional benefits of fish consumption in the UAE and to determine appropriate methods to communicate risk and benefit information to the UAE population.     

Education for the Group Worker's Reality: The Special Qualities and World View of Those Drawn to Work with Groups

SUMMARY

Within the social work profession, one's world view, one's beliefs and values based on one's experiences, strongly influences one's practice and comfort with groups. This paper will examine some of the different ways of viewing the world held by practitioners and students in relation to the likelihood that they will be able to work effectively with groups. Such examination, and the identification of the differences among social workers that results from it has implications for both teaching and supervision in social work. These implications will be discussed and specific principles and techniques for teaching social workers, in education and in supervision, based on their world views will be described. This paper aims to enrich education for group work so that the community of social group work practitioners can grow and continue to thrive.     

论中国回族及其文化

回族是在中国历史上发展形成的一个民族群体,并对中国社会发生重大的影响。把民族与宗教信仰紧密联系在一起,是中国回族最突出的特点,也是最重要的特点。中国回族实际上是直接受到两种思想和两种文化的影响和教育。中国回族先民在融会贯通伊斯兰思想和儒家思想方面,有许多创新和独到之处,积累了丰富的经验,提出了许多切实可行的理论和观点,取得了很好的效果,也树立了不同思想和文化之间交流和对话的典范。今天,在新形势下,我们更应该发扬这种精神,积极创造条件,加强民族团结,促进社会和谐。     

阿拉伯-伊斯兰世界群体文化心理蠡测(上)

曾经的辉煌与当下的衰败、曾经的核心与目前的边缘化所造成的失落感,三大圣地、《古兰经》与先知穆罕默德的相继蒙羞和遭辱所带来的受辱感,历史的创伤记忆与现实的生存困窘共同积淀成了一种顽强的集体潜意识,形成阿拉伯—伊斯兰民众仇恨与暴力相交织的心理死结,外现为以暴易暴、铤而走险甚至不断丧失自我。因此,阿拉伯—伊斯兰世界应在不断抵抗西方霸权主义对中东诸多利益的制衡中,努力变革滞后于全球化主潮的落后现状。否则,将面临更为严重的民族和地区的倒退,危及世界和平与稳定。