HIV prevalence for New York State using Newborn Seroprevalence and AIDS Surveillance Data

The objective of this work is to estimate human immunodeficiency virus (HIV) prevalence in the adult populations of New York City, and of New York State (NYS) excluding New York City. Evidence is presented that not all HIV-infected persons live long enough to satisfy an acquired immunodeficiency syndrome (AIDS) diagnosis. The term preAIDS mortality refers to the mortality of HIV-infected persons, due to any cause, before they can be diagnosed with AIDS. The effect of preAIDS mortality on the estimate of HIV incidence, using back calculation of AIDS Surveillance Data, is to produce low-biased estimates of HIV incidence and prevalence.Estimates of HIV prevalence in women of childbearing age were obtained from the Newborn Seroprevalence Survey [Lessner L. The estimation of HIV prevalence for women of childbearing age in New York City, presently under review]. HIV-positive women in this population typically do not have an opportunistic infection. Thus estimates of HIV prevalence in this population occurred earlier in the spectrum of HIV disease then when they finally satisfied the definition of AIDS that depends on incidence of an opportunistic disease. These earlier estimates of HIV prevalence in women were found to be substantially larger then those obtained from back calculation using female AIDS Surveillance Data. This comparison was used to obtain a quantitative measure R of the effect of preAIDS mortality on HIV prevalence: where 1/R equals the proportion of HIV-infected intravenous drug users that become AIDS cases The preAIDS mortality adjustment factor R was used in the estimation of HIV prevalence and incidence for NYS. We believe that the use of the adjustment factor resulted in more accurate estimates. Using this factor, our estimated HIV incidence for New York City in 1991 was nearly 26% larger than without the adjustment while projected HIV prevalence for 1996 was nearly 27% larger. The paper estimates HIV prevalence. The AIDS Surveillance operation uses AIDS cases to back calculate HIV incidence and prevalence. Since many HIV-infected intravenous drug using (IDU) population die before they become an AIDS case, the estimates from the back calculation are low biased. Low biased because there were many HIV-infected people who died before they ever satisfied the AIDS protocol. The totals presented here adjust for preAIDS mortality and are necessarily larger than what was recorded by the NYS Dept. of Health. After the change in the definition of AIDS to simply HIV prevalence and the change to electronic reporting, the totals were mostly HIV cases reported in the given year and not AIDS. Thus there is no comparison. This paper represents the last best look at the natural history of AIDS in NYS.     

Global M&A: Still the chocolate industry sweetspot?

Like a dividing cell under the microscope, the American snack food market has split apart into two distinct cells, each with its own unique consumer DNA. The two market segments can best be defined as legacy consumers and next‐generation consumers. This tectonic shift in the confectionery industry may make global industry‐giant mergers more a battle between dinosaurs, lit by meteor light.     

Is Africa integrating? Evidence from product markets

This paper presents a price-based assessment of product market integration in Africa using disaggregated retail prices for 91 products and 12 African cities from 1991 to 2008. We find evidence of substantial deviations from the law of one price ? product price differences between the cities averaged 76% over the period – a result that is consistent with the presence of large barriers to trade in the continent. Mean price differences across cities fell by close to a quarter over the period, but the decline was concentrated in the early 1990s with little progress subsequently, despite the regional trade policies implemented by the countries. Gravity-style estimates reveal that reductions in external tariffs and global trends towards price convergence in the early 1990s are the key contributors to the trend in price integration amongst the African cities.     

Generation Y’s Ethical Ideology and Its Potential Workplace Implications

Generation Y is a cohort of the population larger than the baby boom generation. Consisting of approximately 80 million people born between 1981 and 2000, Generation Y is the most recent cohort to enter the workforce. Workplaces are being redefined and organizations are being pressed to adapt as this new wave of workers is infused into business environments. One critical aspect of this phenomenon not receiving sufficient research attention is the impact of Gen Y ethical beliefs and ethical conduct in workplace contexts. It is widely accepted that distinct generational experiences shape ethical ideologies and ethical ideologies in turn affect the way people function in the workplace. Thus, Gen Y’s unique cohort experiences are likely to shape their ethical ideologies and consequent workplace judgments and actions. In this article, we examine Gen Y’s ethical ideology and study its impact on workplace functioning regarding leadership style, teamwork, and judgments about ethical violations. Our analyses indicate that Gen Y’ers tend toward situationalism (high idealism and high relativism), and their socially connected orientation produces more lenient judgments of collaborative vs. unilateral ethical violations. However, Gen Y’ers do exhibit individual variation. Relativist Gen Y’ers are more tolerant of ethical violations, whereas, Gen Y Idealists are less tolerant of ethical violations. High Idealists also show stronger teamwork and leadership characteristics. In addition, Gen Y’ers possessing servant leader traits exhibit incrementally better teamwork, and greater perceived unacceptability of ethical violations. We conclude by discussing implications of these findings for managing ethical climates and conduct.     

A characterization of social choice correspondences that implement the core of simple games

In a coalitional voting game, an alternative is said to be in the core when no majority is willing to replace it with another alternative. A social choice correspondence is a mapping which associates any profile of voters’ preferences with a non-empty subset of the set of alternatives, which is understood as the set of selected outcomes. We characterize the social choice correspondences which always select the core of a simple game for any profile of preferences. This work was completed when B. Tchantcho was Visiting assistant Professor at UTA (University of Texas at Arlington). We acknowledge the support of the Department of Mathematics of UTA. We are most grateful to R. Pongou of Brown University, USA for his help and advice. We sincerely thank N.G Andjiga for his helpful comments and we are indebted to two anonymous referees for their helpful comments.