Sequential sampling in the search for new shared species

In microbial sciences, as well as other disciplines, it is often valuable to sample communities in a sequential or group sequential manner, in order to determine their structure or their similarity. We develop sequential sampling procedures to accomplish this by first assuming that one observation is drawn with replacement from each population at a time. Suppose that the sampling is terminated after n pairs of observations and k shared species were discovered, and assume that we receive payoff h(k)−cn, where h(k) is non-decreasing and the sampling cost c is non-negative. Similar to Rasmussen and Starr (1979), we show that an optimal stopping rule exists if h(k+1)−h(k) is non-increasing. An analogous result holds for group sequential sampling. This leads to using an estimate of the probability of discovering new shared species as a stopping indicator for comparing two populations with respect to the similarity index. We show by simulation and real examples that this is a feasible approach which can help to reduce the sample size.     

The influence of victim gender and sexual orientation on judgments of the victim in a depicted stranger rape

This study investigated the impact of respondent gender, victim gender, and victim sexual orientation on judgments toward the victim of a depicted stranger rape. Respondents were required to read a scenario in which victim gender and sexual orientation varied between subjects, and to complete measures of behavioral blame, responsibility, and severity of the attack. Results revealed that male respondents made more anti-victim judgments than female respondents did. Male respondents judged gay male victims more negatively than they did other victims. Female respondents' judgments were pro-victim regardless of victim gender and victim sexual orientation. Results are discussed in relation to the feminist analysis of victim blame, and blame toward male rape victims. Implications for support services, particularly of male victims, are also considered.     

Age differences in alcohol and cocaine expectancies and attitudes

Positive and negative expectancies regarding the behavioral effects of alcohol and cocaine were assessed and used to predict attitudes toward their use across four age groups (5-7, 8-10, 11-14, and 18-25, N = 121). Regardless of gender and minority status, children and early adolescents appeared to overgeneralize their beliefs about alcohol to a less familiar drug, cocaine, perceiving the effects of the two drugs similarly. Only college students differentiated between drugs, perceiving cocaine as less likely than alcohol to produce drunkenness and more likely to have stimulant and elation/empowerment effects. With age and other expectancies controlled, expectancy of drunkenness was the best predictor of disapproval of alcohol use; attitudes toward cocaine use were unrelated to expectancies but became more negative with age. Drug prevention programs should rest on data regarding children's preexisting beliefs about the consequences of drug use and should help them understand that different drugs (for example, stimulants and depressants) pose different dangers.     

Exploring college student gambling motivation

The present research combined qualitative and quantitative approaches in examining gambling motives among college student gamblers. A comprehensive set of 16 gambling motives was identified by categorizing 762 open-ended reasons for gambling, provided by 184 college student gamblers. Results revealed that most college students gamble to win money, for fun, for social reasons, for excitement, or just to have something to do. Overall, the results suggest the need for an eclectic biopsychosocial approach with regard to etiology of college student gambling.     

Testing for randomness in stream ciphers using the binary derivative

The binary derivative has been used to measure the randomness of a binary string formed by a pseudorandom number generator for use in cipher systems. In this paper we develop statistical properties of the binary derivative and show that certain types of randomness testing in binary derivatives are equivalent to well-established tests for randomness in the original string. A uniform method of testing randomness in binary strings is described based on using the binary derivative. We show that the new tests are faster and more powerful than several of the well-established tests for randomness.     

Developing strategic thinking

This paper looks at the problem of getting managers to contribute effectively to strategic planning, and focuses on the role of management development approaches in ensuring that this happens. A number of formal, and less formal, management development techniques are discussed in the light of their relevance for developing strategic awareness. The importance of providing exposure to strategic issues at an early stage in managers' careers is stressed, and also the need to encourage managers to take initiatives in obtaining their own development. Some of the most fruitful techniques involve taking full advantage of the ‘natural learning’ that takes place on the job, and those which provide a close integration between management development and the planning process—such as projects and ‘task forces’. Finally the role of senior managers in helping to create and maintain a climate in which strategic abilities can develop is discussed.     

Gender and income inequality in the UK 1968–90: the feminization of earnings or of poverty?

This paper uses data from the Family Expenditure Survey for five selected years between 1968 and 1990 to examine trends in the income distribution in the UK, highlighting the role of women's labour force participation and earnings. The increased labour force participation of married women (especially mothers of young children in the 1980s) made a greater contribution to the decline of the 'traditional' male breadwinner family than the increased number of lone parents. The lower half of the distribution of weekly earnings became increasingly dominated by women. Though women's weekly earnings remained low relative to men's, the increase in their participation meant that, over the period, an increased share of family income came from women's labour market income: in 1990 nearly a quarter of the income of families with children came from women's earnings. Women's earnings were an important factor in keeping families out of poverty. There was no trend towards increasing feminization of poverty over the sample period. Adult women were somewhat more likely to be poor than adult men were, but female-headed families were very much more likely to be in poverty, and much more dependent on state benefits, than male-headed families were. Women's increased role in the labour market affected those in male-headed families more than those in female-headed families. Alongside a broad tendency for women's earnings to reduce poverty and inequality, there is evidence that the female population has become more economically polarized.     

Challenging cultural constraints: a personal testimony

DISHA is one of the oldest Oxfam project partners in Uttar Pradesh, India. DISHA works with rural women and rope-makers; it encourages village-level women's organizations to fight against obstacles to women's empowerment and to institute income-producing activities; and it provides legal, educational, and health care services. In this article, a Muslim woman tells the story of her involvement with DISHA and how that involvement gave her the courage to reject the restrictions of purdah and of the wearing of the bourkha. This woman was married at age 13. She suffered ill treatment at the house of her in-laws and returned to her father's home with her 3 daughters. Her husband eventually joined her at her father's house. She was approached by a coordinator of DISHA and asked to apply for a job. She was offered the job, which she accepted. When she started going into the villages, she felt that the restrictive dress of the bourkha interfered with her ability to work. With the permission of her father and her husband, she set aside the bourkha. She had to endure criticism and censure for this action, but eventually people have been won over to her position as they have seen the positive results of her work on behalf of society. After having 5 daughters, she finally had a son. Now she is determined that her daughters will never wear the bourkha, even if they must remain single as a result of this resolve. She feels that DISHA has given her the power to overcome oppression in her own life, in the life of her family, and in society.     

Perceived norms and alcohol consumption: differences between college students from rural and urban high schools

OBJECTIVE: The authors examined perceived norms and drinking among college students who attended high schools in rural and urban communities. PARTICIPANTS AND METHODS: Undergraduates (99 men and 85 women) who attended high schools in communities with populations ranging from less than 100 to more than 400,000 completed surveys assessing perceived norms and alcohol consumption. RESULTS: Analyses revealed that students from smaller towns and in smaller high school graduating classes reported heavier drinking and that perceived norms were positively associated with drinking. Perceived norms were unrelated to population variables, and the relationship between perceived norms and drinking did not vary as a function of population variables. Results suggest that differences in drinking as a function of coming from more rural areas contribute to drinking behavior in college independently of perceived norms. CONCLUSIONS: College students may adjust to campus drinking norms relatively quickly, and longitudinal research would be useful in understanding this transition.