An Observational Investigation of Poker Style and the Five-Factor Personality Model

Little empirical investigation has been made of the relationship between personality and gambling play style. In an observation of on-table poker behavior, this study classified 44 players competing in an amateur league (43 male; mean age 32) according to two main dimensions of play style; tight or loose and aggressive or passive. Superstitious beliefs towards the game were additionally measured. The NEO-PI-R questionnaire (Costa and McCrae, Revised NEO personality inventory (NEO-PI-R) and NEO-five factor inventory (NEO-FFI) professional manual, 1992) was used to measure personality according to the five-factor model. Results showed players with superstitious beliefs to be significantly higher in neuroticism and lower in conscientiousness and than those with no superstitious beliefs. Results approaching significance showed players adopting an aggressive style to be higher in extraversion than passive players and superstitious players to be lower in extraversion than non-superstitious players. Analysis of play style according to age of player revealed a significantly higher mean age among loose compared to tight players. Implications of results concerning validity of these style classifications and potential development in future work are discussed.     

Pond age and riparian zone proximity influence anuran occupancy of urban retention ponds

Urbanization is widespread throughout the United States and negatively affects many wildlife populations. However, certain urban features, such as retention ponds, may provide habitat for some species, such as amphibians. This study examines the influence of riparian zone proximity and pond age on retention pond occupancy by anurans. We identified and estimated the age of 25 retention ponds near Charlotte, North Carolina, USA and used a geographic information system to determine the distance to the nearest riparian zone. Occupancy modeling indicated that anuran presence decreased with increasing distance to riparian zone. Pond age also appeared to be an important factor, but the effect varied among species. Although the results of this study demonstrate the potential value of retention ponds to anurans, it is important to be conservative in estimating the ability of these ponds to sustain amphibian populations in urbanized regions.     

THE CHALLENGE OF MANUFACTURING ADVANTAGE

In spite of the significant progress made by a wide range of manufacturing companies over the past decade, few senior executives in U.S. firms would point to manufacturing as a significant source of competitive advantage. This paper seeks to explore some of the basic reasons for this. It begins by providing a framework for manufacturing competitiveness. It then outlines a handful of characteristics that seem to have been pervasive in a wide range of manufacturing competitiveness programs over the past decade. In contrast to those characteristics, it uses three quite different organizations to illustrate a very different mode for pursuing manufacturing competitiveness. Finally, the paper concludes by outlining three elements that appear to be essential in the successful pursuit of manufacturing advantage.     

Harsh Physical Discipline in Childhood and Violence in Later Romantic Involvements: The Mediating Role of Problem Behaviors

This study examines the impact that experiencing harsh physical discipline in childhood and engaging in problem behaviors during adolescence and young adulthood have on experiencing and perpetrating intimate violence. Using LISREL 7, we tested a model based on social learning theory, Freudian theory, and theories of deviance. The 608 cases analyzed are from a longitudinal study of adolescents conducted in 1982 and 1992–1993. The results suggest that harsh physical punishment in childhood is directly related to greater perpetration of violence against an intimate partner later in life. The enactment of problem behaviors in adolescence and young adulthood was also found to increase the level of perpetration of violence against an intimate partner. In addition, harsh physical punishment in childhood was found to be indirectly but significantly related to increased perpetration via the intervening variables of adolescent and young adult problem behavior. We hypothesized that perpetration and victimization are significantly related to one another bidirectionally, but the results only support that greater levels of perpetration lead to increased levels of victimization.     

Ridge estimation in generalized linear models and proportional hazards regressions

Conventionally, a ridge parameter is estimated as a function of regression parameters based on ordinary least squares. In this article, we proposed an iterative procedure instead of the one-step or conventional ridge method. Additionally, we construct an indicator that measures the potential degree of improvement in mean squared error when ridge estimates are employed. Simulations show that our methods are appropriate for a wide class of non linear models including generalized linear models and proportional hazards (PHs) regressions. The method is applied to a PH regression with highly collinear covariates in a cancer recurrence study.