DO NOT WEIGHT FOR HETEROSCEDASTICITY IN NONPARAMETRIC REGRESSION

The potential role of weighting in kernel regression is examined. The concept that weighting has something to do with heteroscedastic errors is shown to be false. However, weighting does affect bias, and ways in which this might be exploited are indicated.     

Revisiting children 'home on trial' in the context of current concerns about the costs and effectiveness of the looked-after children system: findings from an exploratory study

Statute and practice relating to s.31 part IV of The Children Act 1989 allow children subject to care orders to be placed at home with their parent(s). It is not uncommon for the courts to accept a plan for children to return home at the final hearing of care proceedings at which full care orders are granted. In such instances, children retain looked‐after status but, in terms of their day‐to‐day care, are looked after by parent(s). Whilst there are a small number of studies conducted in the 1990s relating to children ‘home on trial’, there is a much more limited recent literature. It is important to revisit this population of children, given current concerns about the burgeoning costs of child care proceedings and the looked‐after children system (LAC). This paper reports on a small‐scale exploratory study in one north‐west local authority area. Consisting of a file study and interviews with parents and professionals, the study examines the factors that contributed to initial removal of children to public care, the impact of the LAC system for children ‘home on trial’, stability of placements at home, as well as issues to do with the discharge of care orders. Particular attention is drawn to lone father headed households, a social group over‐represented in our sample. The study aims to inform further multi‐location studies.     

A Model of Choice for Public Policy

Punctuated equilibrium is supposed to be a viable alternativeto incrementalism, and, indeed, the authors of the model havesometimes made such claims. But punctuated equilibrium was developedto explain change in policy subsystems and does not serve asa complete model of policy choice in the same way that incrementalismhas served. This article develops a full-blown and viable modelof choice for public policy based on disproportionate informationprocessing. Its dynamics are based in the allocation of politicalattention to policy topics and the manner in which politicalsystems process information. The model leads directly to outcomesthat are consistent with punctuated equilibrium and are notgenerally consistent with incrementalism. Incrementalism, however,may be deduced from the model as a special case. The model isbest tested using stochastic process approaches. Incrementalismlogically must yield a normal distribution of outcomes, butdisproportionate information processing yields leptokurtic outcomes.Adding institutional constraints only makes the stochastic processimplications more severe. To support our arguments, we presentboth static and dynamic simulations of these processes. We alsoshow that these simulations are consistent with observationsof U.S. government budgets.     

Using the Image Exchange to Enhance Interdisciplinary Team Building in Child Welfare

A team building activity, the image exchange, was helpful to interdisciplinary teams in clarifying perceptions and opinions of participants about the roles of each discipline (child welfare, domestic violence, mental health, and substance abuse workers) at a five-day interdisciplinary training workshop. Discussion of team members’ perceptions and views provided opportunities to develop insights about misperceptions. Training in team development and role clarification provided a foundation for the development of effective interdisciplinary collaboration, which may improve interdisciplinary practice.Dr. Packard is an Associate Professor and Dr. Jones is a Professor in the School of Social Work at SDSU. At the time of writing, Ms. Nahrstedt was a Research Assistant in the School of Social Work at SDSU. This project was funded by a grant from the U.S. Department of Health and Human Services, Administration for Children, Youth, and Families.     

Ratio-Scale Measurement with Intransitivity or Incompleteness: The Homogeneous Case

In the homogeneous case of one-dimensional objects, we show that any relation that is positive and homothetic can be represented by a ratio-scale and a unique and constant biasing factor. This factor may favor or disfavor the preference for an object over another. In the first case, preferences are complete but not transitive and an object may be preferred even when its value is lower. In the second case, preferences are asymmetric and transitive but not negatively transitive and it may not be sufficient for an object to have a greater value to be preferred. In this manner, the biasing factor reflects the extent to which preferences may depart from a maximization process.