A comparison study of nonparametric imputation methods

Consider estimation of a population mean of a response variable when the observations are missing at random with respect to the covariate. Two common approaches to imputing the missing values are the nonparametric regression weighting method and the Horvitz-Thompson (HT) inverse weighting approach. The regression approach includes the kernel regression imputation and the nearest neighbor imputation. The HT approach, employing inverse kernel-estimated weights, includes the basic estimator, the ratio estimator and the estimator using inverse kernel-weighted residuals. Asymptotic normality of the nearest neighbor imputation estimators is derived and compared to kernel regression imputation estimator under standard regularity conditions of the regression function and the missing pattern function. A comprehensive simulation study shows that the basic HT estimator is most sensitive to discontinuity in the missing data patterns, and the nearest neighbors estimators can be insensitive to missing data patterns unbalanced with respect to the distribution of the covariate. Empirical studies show that the nearest neighbor imputation method is most effective among these imputation methods for estimating a finite population mean and for classifying the species of the iris flower data.     

A Kantian-Style Critique of Person-in-Environment

This article provides a historical and philosophical analysis of the intellectual thought supporting ecological systems theory and the person-in-environment model. It offers a critique outlining both strengths and shortcomings by analyzing the claims to validity upon which the theory rests. These claims rest on an analogy with various theories empirically established in the natural sciences; as such, validity claims rest heavily upon the emphasis of humans' continuity with animals. Consequently, the claims' shortcomings arise from their inability to address adequately issues arising from qualities that make humans distinct from animals—such as language and its impact upon culture, history, human relationships, and our ability to construct our environment and thus do more than simply interact with the environment.     

Foster fathers performing gender: the negotiation and reproduction of parenting roles in families who foster

ABSTRACT

Foster care research and social work practice tend to focus on how women look after children living in foster care. This focus has limited our understanding of what it is that men do within foster caring families and they are automatically assigned secondary or breadwinning roles. Families who foster involve some form of renegotiation of roles to care for children they foster. While foster caring arrangements are internationally diverse, foster carers often work with social workers. It would therefore seem important for social workers to understand how foster carers negotiate their parenting roles. This paper reports findings from seven main caring foster-fathers who took part in a wider study involving twentythree foster-fathers. The evidence provided by these foster-fathers demonstrate they are highly motivated to care for children and, alongside delivering traditional parenting roles, they negotiate new, non-traditional parenting roles as foster-fathers. These new roles, taken on by foster-fathers, often challenge stereotyped masculinity while they also concurrently enact parenting norms. This study applied Judith Butler’s work on performing gender to foster caring families to theorise on the process whereby foster-fathers negotiate diverse masculinities and continue to reproduce gendered relations in foster caring families.     

Urban Poverty,Ethnicity, and Personality Development

There are multiple factors which contribute to the development of the individual’s personality. Many of these factors have been amply discussed in traditional theories of personality Jonnation. An area that has been neglected in these discussions has been the role that poverty and ethnic and cultural factors may have in this regard. This paper offers a discussion of these issues with special emphasis on cultural, ethnic, and socioeconomic factors which tend to characterize the lives of Latino and Black individuals. Recommendations are made for a re-evaluation of the traditional theories of personality when applied to poor and minority individuals.     

Male Juveniles with Sexual Behavior Problems: Are There Differences Among Racial Groups?

This study used archival data on a sample of 186,492 referrals from a southwestern state Juvenile Probation Commission to compare the characteristics of 5,439 male Black, Hispanic, and White juveniles with sexual behavior problems on the five most common sexual offenses in the data set. The characteristics of 181,053 juveniles of the three races without sexual behavior problems were also compared on the basis of the seven most common nonsexual offenses. The bases of comparison were the seven variables: reported incidence of sexual offenses, the primary caregivers or living arrangements, age, suspected sexual abuse, suspected emotional abuse, suspected physical abuse, and special education status, on which racial differences were found. Prevention and treatment implications of findings are discussed.     

Values,Morals, and Religion in the Social Studies

Methods for facilitating students' standards-based consumer literacy are addressed via the use of problem solving with food and product labels. Fifth graders will be able to: (1) provide detailed analysis of food and product labels; (2) understand large themes, including production, distribution, and consumption; and (3) explore consumer decision-making skills.