Decision-making in betting markets

The placing of a bet is a classic example of decision-making under uncertainty. A betting market is also an example of a simple financial market, but one which possesses the advantage that each bet is characterised by a well-defined end point at which it possesses a definite value, i.e. the amount won or lost. Leighton Vaughan Williams explains the implications for our understanding of economic decision-making of the observed tendency for the expected returns on bets to differ markedly at different odds levels.     

The Quest for Invisibility: Female Entrepreneurs and the Masculine Norm of Entrepreneurship

The emphasis in research on female entrepreneurship remains focused on the impact of gender on women’s experience of business ownership, often demonstrated through comparisons of male and female entrepreneurs. By contrast, this article explores the differences and divisions between women business owners who are silent about gender issues and those who are not. The main data drawn on in the article are e‐mails conducted through a web‐based entrepreneurial network set up to promote and support women in business, supplemented with interview material derived from an interview study of 19 women business owners. By considering the way in which some women business owners not only treat entrepreneurship as gender‐neutral, but also seek to conceal its gendered nature, we can see how some female entrepreneurs are trying to avoid being identified as different from the masculine norm of entrepreneurship.     

Report on the Workshop on Practical Protection in Humanitarian Crises

With a global crisis of approximately 15 million refugees and an estimated 20 to 25 million internally displaced persons (IDPs) in need of protection, the current protection regime is under increased scrutiny. "Practical Protection" is a fairly new concept. Those pursuing it aim to expand understanding and responsibilities for protection beyond those institutions with a specific protection mandate. "The Workshop on Practical Protection in Humanitarian Crises" was organized to bring the practical protection concept to representatives from a wide range of international agencies, governmental agencies and non-governmental organizations (NGOs), who discussed its implications for their work in humanitarian crises.
Organizations with specific protection mandates, primarily the United Nations High Commissioner for Refugees (UNHCR) and the International Committee for the Red Cross (ICRC), work to protect uprooted groups through legal tools and recognized principles, often in the context of assistance programmes that provide shelter, food, water, medical care, education and other forms of humanitarian assistance. They work in collaboration with NGOs and other international organizations that focus primarily on assisting forced migrants. These latter agencies have traditionally avoided overt involvement in protection activities. When UNHCR and ICRC are not present or are over-extended, gaps in the protection regime emerge. The gap is particularly evident with regard to internally displaced and other war-affected populations, but it is present in most refugee situations as well.     

Assimilation or exclusion? Japanese and Mexican Americans in California

This paper argues that the current socioeconomic positions of ethnic groups reflect in part the historical processes that differentially allocated labor market opportunities by ethnicity. With historical and current data, we illustrate the usefulness of this approach by investigating two ethnic groups at opposite ends of the socioeconomic spectrum—native-born Japanese and Mexican American men and women in California. We first document the structural context facing these two immigrant groups when they entered the U.S., describing how early experiences shaped their occupational concentrations. Using 1980 Census data we then show how the current occupational distributions of these ethnic groups resemble those of their immigrant ancestors, and how this occupational concentration now affects earnings attainment, relative to whites. The evidence on gender differences suggests caution in generalizing from the experiences of male ethnics—the occupational and earnings attainments of female ethnics differ notably from those of their male counterparts.     

Predicting Individual Differences in Recall by Infants Born Preterm and Full Term

A heterogeneous sample of infants with preterm histories and infants born full term participated in a study of declarative memory and rate of encoding, as measured in an imitation task and an examining task, respectively. Here we report the comparisons of the performances of infants born very preterm (27–34 weeks gestation) and moderately preterm (35–37 weeks gestation) to infants born full term (38–41 weeks gestation) and tested at 12 months corrected age (from due date). Lower levels of recall were seen among the infants born very preterm. Rate of encoding, weeks gestation, and score on the Mental Development Index (MDI) of the Bayley Scales of Infant Development were tested as possible sources of individual differences in recall. Rate of encoding and MDI predicted delayed ordered recall. Implications for early detection of cognitive difficulties in children with preterm histories are discussed.     

Methodological Comparisons Between CATI Event History Calendar and Standardized Conventional Questionnaire Instruments

Six hundred and twenty-six participants from the Panel Studyof Income Dynamics (PSID) were interviewed via telephone retrospectivelyabout life course events by either computer-assisted (CATI)event history calendar (EHC) or standardized CATI conventionalquestionnaire (CQ) methods, randomly assigned. Experimentalretrospective reports, for a reference period up to 30 years,were validated against reports provided annually from the PSIDcore interviews. Data quality outcome measures included variablesassociated with marriage, cohabitation, employment, unemployment,residential changes, and cigarette smoking. The EHC providedhigher quality retrospective reports for cohabitation, employment,unemployment, and smoking histories; the CQ provided betterdata quality for marriage history, although what variable wasbeing measured, instead of which method was being used, hadthe biggest impact on differences in data quality. Both EHCand CQ interviews lasted on average around one hour, with theEHC interviews being on average 10 percent longer. Interviewerspreferred the EHC interviews. In both EHC and CQ conditions,respondents generally enjoyed the interviews, and did not findquestions difficult. The costs and benefits of both EHC andCQ methods in the collection of life course retrospective reportsare discussed. Received for publication December 19, 2005. Revision received September 25, 2007. Accepted for publication September 25, 2007.     

A Predictive Model for Survival of Escherichia coli O157:H7 and Generic E. coli in Soil Amended with Untreated Animal Manure

This study aimed at developing a predictive model that captures the influences of a variety of agricultural and environmental variables and is able to predict the concentrations of enteric bacteria in soil amended with untreated Biological Soil Amendments of Animal Origin (BSAAO) under dynamic conditions. We developed and validated a Random Forest model using data from a longitudinal field study conducted in mid-Atlantic United States investigating the survival of Escherichia coli O157:H7 and generic E. coli in soils amended with untreated dairy manure, horse manure, or poultry litter. Amendment type, days of rain since the previous sampling day, and soil moisture content were identified as the most influential agricultural and environmental variables impacting concentrations of viable E. coli O157:H7 and generic E. coli recovered from amended soils. Our model results also indicated that E. coli O157:H7 and generic E. coli declined at similar rates in amended soils under dynamic field conditions.The Random Forest model accurately predicted changes in viable E. coli concentrations over time under different agricultural and environmental conditions. Our model also accurately characterized the variability of E. coli concentration in amended soil over time by providing upper and lower prediction bound estimates. Cross-validation results indicated that our model can be potentially generalized to other geographic regions and incorporated into a risk assessment for evaluating the risks associated with application of untreated BSAAO. Our model can be validated for other regions and predictive performance also can be enhanced when data sets from additional geographic regions become available.