On the one-sample location hypothesis for mixed bivariate data

We study a hypothesis testing problem involving the location model suggested by Olkin and Tate (1961). Specifically, we derive a likelihood ratio lest of the associated location hypothesis as an alternative to the conventional method of carrying out separate tests for each of the parameters. A small sample Monte Carlo comparison indicates the general superiority of the former in terms of statistical power. We also comment briefly on the properties of the test.     

Are Female Executives Over‐represented in Precarious Leadership Positions?

We use a sample of CEO appointments at US corporations over the years 1992–2004 to test the 'glass cliff' hypothesis, which posits that females are appointed to leadership positions at firms that are in a precarious financial condition. Our analysis utilizes three measures of stock-price-based financial performance and two distinct control samples of appointments of males to the CEO position. We find that corporate performance preceding CEO appointments tends to favor females, implying that females (males) are appointed to the CEO position largely at times when the firm is in relatively better (worse) financial health. Disaggregating the data by appointments in up versus down markets, at high-risk versus low-risk firms, and by calendar time yield similar conclusions. There appears to be no glass cliff facing female CEOs at US firms. Our findings suggest a need for additional research to identify where and for what types of positions this phenomenon is prevalent.     

Not Just about Posttraumatic Stress Disorder: A Call for Military-Centric Social Work

Most warriors do not get PTSD but can still be affected by war. The “military gestalt,” defined as the complex myriad of “all things military” including the functions, processes, and human elements related to combat, is seriously impacted by the warrior-in-combat construct that is reflective of the person-in-environment construct. Thus, it suggests that problems within the gestalt can be understood and addressed from a military-centric social work perspective and approach. The situation is so insidious that it requires a call to action from all disciplines but, most important, for the social work profession to take the lead.     

Sex,Arts and Verbal Abilities: Three Further Indicators of How American Life is not Improving

Despite clear evidence that Americans’ economic standard of living has improved over the last half-century in terms of income, ownership of technology and housing among other indicators, there is scant evidence from non-economic quality-of-life (QOL) indicators of improved life quality to parallel these economic gains. The present article adds to this list in showing little if any progress in three QOL indicators (the first two about time and activity) that have received less or no attention in the social indicators literature, namely (1) frequency of the highly enjoyable activity of sex, (2) participation in various serious arts activities and (3) scores of verbal ability. The data on sexual activity and verbal ability come from the 1974–2008 General Social Surveys (GSS) from the University of Chicago, and for the arts from the 2008 Survey of Public Participation in the Arts (SPPA) conducted by the US Census Bureau for the National Endowment for the Arts since 1982. All three surveys interviewed nationally representative samples, with over 70% response rates and sample sizes of more than 15,000 adults. The GSS data on sexual frequency show no significant increase in estimated frequency of sex since 1989, despite its strong appeal and the availability of new societal conveniences. This held both before and after adjustment for the age, marital status and education in the population; contrary to expectation, working long hours was associated with increased sex both before and after adjustment for these other demographic predictors. The SPPA trend data on arts participation actually showed a decline in participation, especially after adjustment for its major predictor of years of education; again no decreased participation was found among those working long hours. While scores on verbal ability in the GSS have stayed rather steady since 1974, they have decreased after MCA adjustment for the increased college education in more recent years, as documented by Nie et al. (2009). Thus, contrary to expectations, increases in public education have not been accompanied by improvements on these three indicators.     

Estimation of gaussian mixtures with rotationally invariant covariance matrices

Homoscedastic and heteroscedastic Gaussian mixtures differ in the constraints placed on the covariance matrices of the mixture components. A new mixture, called herein a strophoscedastic mixture, is defined by a new constraint, This constraint requires the matrices to be identical under orthogonal trans¬formations, where different transformations are allowed for different matrices. It is shown that the M-step of the EM method for estimating the parameters of strophoscedastic mixtures from sample data is explicitly solvable using singular value decompositions. Consequently, the EM-based maximum likelihood estimation algorithm is as easily implemented for strophoscedastic mixtures as it is for homoscedastic and heteroscedastic mixtures. An example of a “noisy” Archimedian spiral is presented.     

Attitudes to Employment of Professionally Qualified Refugees in the United Kingdom

This paper explores the attitudes to work and experiences seeking employment of professionally qualified refugees enrolled on a course to enhance their employability skills in Leeds, United Kingdom (UK). We analyse the results within the framework of conceptual models describing the transition of refugees into employment (which are essentially linear) and those that categorize refugees according to their resettlement styles based on their social features and the host society's response. Our data reinforce that these people are (initially at least) highly motivated to work, strongly identify with their profession and suffer considerable loss of self‐esteem as they are unable to secure appropriate employment. Attitudes to securing employment were often related to their length of time in the UK. Recent arrivals were more positive about returning to their profession, even if this meant retraining, developing skills and time spent in alternative employment. Many of those here for longer were resigned to retraining, and the worst cases felt despair and feelings of betrayal. Our work showed that many had poor job search strategies and a lack of knowledge of the culture and norms of their chosen profession. We argue that the generic support of statutory employment services or the voluntary sector is inappropriate and that there is a role for professional bodies to be more active in their engagement with these groups of people. The results suggest that conceptual models need to be more nuanced to capture the experiences of these refugees: attitudes to work can cycle from optimism to disillusionment, so a linear model will not capture the full complexity, and we also found evidence of shifting among categories of resettlement styles.     

Changes in At-Risk American Men's Crime and Substance Use Trajectories Following Fatherhood

Fatherhood can be a turning point in development and in men's crime and substance use trajectories. At-risk boys (N = 206) were assessed annually from ages 12 to 31 years. Crime, arrest, and tobacco, alcohol, and marijuana use trajectories were examined. Marriage was associated with lower levels of crime and less frequent substance use. Following the birth of a first biological child, men's crime trajectories showed slope decreases, and tobacco and alcohol use trajectories showed level decreases. The older men were when they became fathers, the greater the level decreases were in crime and alcohol use and the less the slope decreases were in tobacco and marijuana use. Patterns are consistent with theories of social control and social timetables.