The brief sexual attitudes scale

The measurement of sexual attitudes is important, and ease of scale usability is one key aspect of measurement. This paper details three studies conducted to develop a briefer and thus more efficient version of the multidimensional Sexual Attitudes Scale (43 items). The first two studies (I and II) employed existing data sets to develop a 23-item version of the Sexual Attitudes Scale, using exploratory factor analysis in Study I and confirmatory factor analysis in Study II. The same four subscales of Permissiveness, Birth Control (formerly called Sexual Practices), Communion, and Instrumentality were retained in the 23-item measure, called the Brief Sexual Attitudes Scale. Study III was a prospective data collection using only the 23 items composing the Brief Sexual Attitudes Scale. The four subscales were hypothesized to correlate with a number of relationship measures in predictable ways. Results indicated that the Brief Sexual Attitudes Scale is a reliable and valid measure of the four sexual attitudes, and has strong psychometric properties. It should be effective and efficient for both research and clinical uses.     

Surface Estimation, Variable Selection, and the Nonparametric Oracle Property

Variable selection for multivariate nonparametric regression is an important, yet challenging, problem due, in part, to the infinite dimensionality of the function space. An ideal selection procedure should be automatic, stable, easy to use, and have desirable asymptotic properties. In particular, we define a selection procedure to be nonparametric oracle (np-oracle) if it consistently selects the correct subset of predictors and at the same time estimates the smooth surface at the optimal nonparametric rate, as the sample size goes to infinity. In this paper, we propose a model selection procedure for nonparametric models, and explore the conditions under which the new method enjoys the aforementioned properties. Developed in the framework of smoothing spline ANOVA, our estimator is obtained via solving a regularization problem with a novel adaptive penalty on the sum of functional component norms. Theoretical properties of the new estimator are established. Additionally, numerous simulated and real examples further demonstrate that the new approach substantially outperforms other existing methods in the finite sample setting.     

Shared housing among young adults: avoiding complications in domestic relationships

One pathway by which young adults in the Western world are navigating housing difficulties is to pragmatically share costs by living or flatting with peers. The current study sought to add to the limited literature on this lifestyle through the application of discursive psychology to understanding the social dynamics of relationships in the intimacy of these households. Data was drawn from interviews with experienced New Zealand house sharers aged 20–35. Analysis is presented of two spontaneous discourses, which emerged, both dealing with competing tensions on the merits of living with couples or single people and friends or strangers. Whereas couples are not averse to sharing with other couples, single people tend to elect to share with unattached individuals. Favouring friends as housemates was the norm among town dwellers, while city folk were more open to flatting with strangers. Talk was driven by the unquestioned value associated with having a working living arrangement, demonstrating the acute awareness young adults have of potential problems that can destabilise or sustain domestic harmony. Valuable insight is provided into the complexity of shared housing relationships as well as contemporary young adulthood.     

Children's Challenges to Efforts to Save Them: Competing Knowledges in the Child Welfare System

The child welfare system is founded on a belief that children are sometimes endangered by their parents or caregivers and must be saved by agents of the state. Children are perceived as objects to be saved, but they are rarely seen as active strategists in their interactions with child welfare system social workers. Using ethnographic data collected during observations of social workers and juvenile court proceedings, this article shows how children have their own complex understandings of state intervention and strive—to varying degrees of success—to contest official views of their lives and provide competing forms of knowledge. Specifically, children attempt to rework state actors' perceptions of their families and familial problems, use state actors as an audience for their versions of their lives, and attempt to mobilize state power for personal or material gain.     

Positive events and quality of life

Research evidence that might either support or deny the substantive contribution of positive life experiences on health and well-being would be of great value. Regrettably clinical research has been concerned primarily with the disruption in well-being and adjustment associated with stressful or otherwise aversive events. While positive events and their effects have not been ignored altogether, investigators traditionally have given them short shrift in developing and testing models of mental health and psychopathology. This paper evaluates some of these beginning efforts at testing the positive events on psychological functioning, and suggests some new directions for future work in this area.     

Child day care provision: Explaining local variation

Drawing on a combination of quantitative and qualitative data, this article seeks to account for variation in the amount and forms of child day care provision amongst British local authorities. Amongst relevant local factors it notes the legacy of earlier child care provision. It considers the association between provision and indicators of need on the one hand and political motivation on the other. Finally it looks at the process of policy making. The conclusion reflects on the implications of these findings for the government's new pledge to meet the child care challenge. Copyright © 2001 John Wiley & Sons, Ltd.     

Spatial prediction of crystalline defects observed in molecular dynamic simulations of plastic damage

Molecular dynamic computer simulation is an essential tool in materials science to study atomic properties of materials in extreme environments and guide development of new materials. We propose a statistical analysis to emulate simulation output with the ultimate goal of efficiently approximating the computationally intensive simulation. We compare several spatial regression approaches including conditional autoregression (CAR), discrete wavelets transform (DWT), and principle components analysis (PCA). The methods are applied to simulation of copper atoms with twin wall and dislocation loop defects, under varying tilt tension angles. We find that CAR and DWT yield accurate results but fail to capture extreme defects, yet PCA better captures defect structure.     

Sexual abuse in adulthood: Ongoing risks for people with learning disabilities

This paper reports findings of a 3-year research programme into the sexual abuse of adults with learning disabilities conducted at the University of Kent. Inconsistent reporting to and by services can be seen in the results, including lack of agreed practice around consent to sexual activities between service users. Abuse is also perpetrated by staff, volunteers, family members and other known and trusted adults. Thus both definition and detection are important competencies for services to develop. Abuse reported was predominantly perpetrated by men on both women and men with learning disabilities, and the gender issues raised by tackling sexual abuse in unequal staff teams, with their male style of management and a female workforce, are considered. Outcomes of the reporting process are considered and services for adults are urged to take a more proactive stance.     

Polyhedral combinatorics of the cardinality constrained quadratic knapsack problem and the quadratic selective travelling salesman problem

This paper considers the Cardinality Constrained Quadratic Knapsack Problem (QKP) and the Quadratic Selective Travelling Salesman Problem (QSTSP). The QKP is a generalization of the Knapsack Problem and the QSTSP is a generalization of the Travelling Salesman Problem. Thus, both problems are NP hard. The QSTSP and the QKP can be solved using branch-and-cut methods. Good bounds can be obtained if strong constraints are used. Hence it is important to identify strong or even facet-defining constraints. This paper studies the polyhedral combinatorics of the QSTSP and the QKP, i.e. amongst others we identify facet-defining constraints for the QSTSP and the QKP, and provide mathematical proofs that they do indeed define facets. Author now works at Motorola. (2005 onwards)