Early to bed and earlier to rise: school,maternal employment,and children’s sleep

School-age children need 10–11 h of sleep per night. It has been well-documented that lack of sleep leads to diminished cognitive performance and that people who sleep less are more likely to be overweight or obese. I use data from the American Time Use Survey to examine two factors that can potentially influence the amount of time children sleep: school and maternal employment. I find that school-age children sleep less when school is in session than during the summer, and that they get less sleep on school nights than on non-school nights. Children go to bed about 38 min earlier on school nights, but wake up about 72 min earlier on school days. This translates into about 34 min less sleep on school nights compared with non-school nights, and implies that these children have a cumulative sleep deficit of over two-and-a-half hours by the time they arrive at school Friday morning. In addition to the lost sleep time, the earlier wake-up times on school days appear to disrupt children’s natural sleep cycles. Maternal employment affects children’s sleep time in the summer, because children wake up earlier on days that their mothers work. But during the school year, maternal employment effects are dominated by school effects.     

UNEMPLOYMENT BENEFITS AND UNEMPLOYMENT IN AUSTRALIA, 1950–89

Although the incidence of unemployment in Australia is well established, the causes of unemployment remain controversial. Various putative causes for unemployment exist, including the unemployment benefits system. The present study sought to estimate the impact of the generosity of Australian unemployment benefits on the measured unemployment rate of three recipient groups, single adult males over 21, married males, and married males with two children, for the period 1950 to 1989 inclusive. The results of this statistical exercise are largely consistent with similar work done in Australia and elsewhere; namely, that while unemployment benefits did increase the measured rate for unemployment during the period 1950 to 1989 to a statistically significant degree, other stronger influences on unemployment were evident.     

A review of parallel processing for statistical computation

Parallel computers differ from conventional serial computers in that they can, in a variety of ways, perform more than one operation at a time. Parallel processing, the application of parallel computers, has been successfully utilized in many fields of science and technology. The purpose of this paper is to review efforts to use parallel processing for statistical computing. We present some technical background, followed by a review of the literature that relates parallel computing to statistics. The review material focuses explicitly on statistical methods and applications, rather than on conventional mathematical techniques. Thus, most of the review material is drawn from statistics publications. We conclude by discussing the nature of the review material and considering some possibilities for the future.     

Alcohol’s Effects on Video Lottery Terminal (VLT) Play Among Probable Pathological and Non-Pathological Gamblers

This study tested whether alcohol increases behaviors associated with video lottery terminal (VLT) play, particularly among probable pathological gamblers. Forty-four regular VLT players were designated either probable pathological gamblers or non-pathological gamblers on the basis of scores on the South Oaks Gambling Screen (SOGS); [Lesieur & Blume (1997). American Journal of Psychiatry, 144, 1184–1188] Gamblers from each SOGS category were randomly assigned to either a moderately intoxicating alcohol dose or a control beverage condition (n = 11 per cell in the 2 × 2 between-subjects design). Following beverage consumption and absorption, participants played a video poker VLT game for up to 30 minutes. Four behaviors were measured: “power-bets” (doubling bet after viewing only two cards of the five-card poker hand); total money spent; mean bet magnitude; and number of minutes played. Alcohol increased time spent playing and rate of power-bets, particular among the probable pathological gamblers. Post hoc analyses revealed that alcohol also influenced the proportion of losing hands played––increasing them among the probable pathological gamblers while decreasing them among the non-pathological gamblers. Clinical and policy implications of the findings are discussed.     

Management paradigms for the new millennium

A proliferation of paradigms is occurring in management thought and practice, defining paradigms as means of understanding the world and a basis for informing action. Frequent paradigm shifts are essential for survival in a business context of constant innovation. While the idea of paradigms has been widely received in management, it has been so more as a contested than a settled domain. Management paradigms are far more numerous than those of the natural sciences that Kuhn studied. Kuhn expected the long periods of normality to be marked by an absence of paradigmatic questioning and strife. In management, at any time, there are a number of competing paradigms available.
Kuhn was concerned to chart how changing realities of investigation were tied up with changing perceptions. In business the focus has been much more on the changing realities rather than changing perspectives. In any system that is ecologically interdependent, if you change any paradigmatic part then you change the whole. When there is sufficient change and fluidity in a system then we can speak of a 'paradigm shift': that period when a shift occurs from one paradigm set to another, the transition from one wave to the next. In these conditions uncertainty and ambiguity will apply. Discontinuous change is a step shift in the rate of change that invalidates existing assumptions and begins to transform the rules of competition.