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.     

Time Insensitivity for Protective Investments

Investments in protective measures involve an initial immediate cost in exchange for a stream of potential benefits accruing over time in the form of reduced expected losses. This paper describes two studies in which individuals were asked both to make choices and indicate the maximum amount they were willing to pay (WTP) for such protective measures. By varying the number of years that the measures provided protection, we observed four different decision strategies that individuals use to determine their maximum WTP. The findings from these experiments strongly suggest that most individuals do not take into account the added benefits of having a protective measure in place over a longer period of time when determining the likelihood of purchasing protection or the maximum price they are willing to pay. The behavior of a relatively small proportion of the subjects was consistent with a discounted utility model. Most subjects were either myopic in their behavior or did not change their maximum WTP as the time horizon changed. Despite the fact that most subjects were insensitive to time changes, they were generally willing to purchase the protective measures. Implications of these results for investment in risk mitigation measures are briefly explored.     

Overcoming Ungrievability: Transgender Expectations for Identity after Death

Butler (Precarious Life: The Powers of Mourning and Violence. London, UK: Versa; 2004) observed cultural shifts immediately after 9/11 and suggested that, with regard to grievable and ungrievable lives, societal power structures “produce and maintain certain exclusionary conceptions of who is normatively human” (p. xiv–xv). The current study brings new understanding to the concept of grievability by exploring the symbolically violent de-transitioning of trans people after their deaths. The aim of this exploratory study was to examine the thoughts and attitudes of older trans people (40 y. o. plus) with regard to the phenomenon of nonconsensual de-transitioning after death and the expectations they have regarding the expression of their own identity after death. The wishes of the participants were grouped into four outcome categories: hoping to be memorialized only as their lived identity (25%); only as their identity-assigned-at-birth (6%); as both identities combined (44%); and those who claimed that they did not care how their identity was memorialized (25%). Our findings serve to emphasize the importance of open and honest end-of-life communication as well as to underscore the diverse nature of the transgender population and the complexity of the transgender identity.     

Relationship Separation and Help-seeking: Reporting on an Agency Study

Relationship separation affects many Australians with around 20,000 divorces involving children formalised per year. For profit, government and nongovernment organisations all offer services for separated couples and families. Despite promotion of specialist services such as mediation and child-centred services, which seek to assist families to navigate what is a complex interaction between public and legislative structures, there is little known about the potentially broader array of supports and information people use following separation. Better understanding of help-seeking behaviours for separating couples enables more effective targeted policy and service delivery. Individuals with children accessing a nongovernment-funded program for support during separation (n?=?134) were asked to complete a survey that was designed to track their help-seeking behaviour. We found that help-seeking for legal services was more common than seeking help for self-care, but that both were important for many people in the sample. Friendship networks, and medical and health professionals were the most common sources of information and support. We argue that social work has a role in promoting and supporting parents who are separating to access a broader range of informal support networks and professional services.     

The Subjective Well-Being of Immigrants Aged 50 and Older in Israel

The present study evaluated the integration of elderly people who migrated to Israel during their lifetimes. Subjective well-being, as measured by the immigrants’ perception of quality of life, satisfaction with life and emotional state, served as a general indicator of integration. The integration of elderly immigrants has not received adequate attention in the literature. A unique database (SHARE-Israel) that was recently released has made study of this topic possible. The current study sample was composed of former migrants aged 50 and older (n = 930). The analytic model examined ethnic origin and migration variables in relation to the respective subjective outcomes, controlling for sociodemographic background, human and social capital and health. The findings show that in general, ethnic origin seems to matter less for the evaluation of immigrants’ subjective well-being than other socio economic factors such as economic status, social capital and health status. However, recent arrivals from the Former Soviet Union do differ from all other immigrant groups in their lower levels of well-being. In addition, the study points to the importance of language proficiency as a central means for integration in the destination country.     

Knowledge translation efforts in child and youth mental health: a systematic review

The availability of knowledge translation strategies that have been empirically studied and proven useful is a critical prerequisite to narrowing the research-to-practice gap in child and youth mental health. Through this review the authors sought to determine the current state of scientific knowledge of the effectiveness of knowledge translation approaches in child and youth mental health by conducting a systematic review of the research evidence. The findings and quality of the 12 included studies are discussed. Future work of high methodological quality that explores a broader range of knowledge translation strategies and practitioners to which they are applied and that also attends to implementation process is recommended.     

Bayesian variable selection using an adaptive powered correlation prior

The problem of selecting the correct subset of predictors within a linear model has received much attention in recent literature. Within the Bayesian framework, a popular choice of prior has been Zellner's g$g$-prior which is based on the inverse of empirical covariance matrix of the predictors. An extension of the Zellner's prior is proposed in this article which allow for a power parameter on the empirical covariance of the predictors. The power parameter helps control the degree to which correlated predictors are smoothed towards or away from one another. In addition, the empirical covariance of the predictors is used to obtain suitable priors over model space. In this manner, the power parameter also helps to determine whether models containing highly collinear predictors are preferred or avoided. The proposed power parameter can be chosen via an empirical Bayes method which leads to a data adaptive choice of prior. Simulation studies and a real data example are presented to show how the power parameter is well determined from the degree of cross-correlation within predictors. The proposed modification compares favorably to the standard use of Zellner's prior and an intrinsic prior in these examples.     

How Do Gamblers End Gambling: Longitudinal Analysis of Internet Gambling Behaviors Prior to Account Closure Due to Gambling Related Problems

Objective: To examine behavioral patterns of actual Internet gamblers who experienced gambling-related problems and voluntarily closed their accounts. Design: A nested case–control design was used to compare gamblers who closed their accounts because of gambling problems to those who maintained open accounts. Setting: Actual play patterns of in vivo Internet gamblers who subscribed to an Internet gambling site. Participants: 226 gamblers who closed accounts due to gambling problems were selected from a cohort of 47,603 Internet gamblers who subscribed to an Internet gambling site during February 2005; 226 matched-case controls were selected from the group of gamblers who did not close their accounts. Daily aggregates of behavioral data were collected during an 18-month study period. Main outcome measures: Main outcomes of interest were daily aggregates of stake, odds, and net loss, which were standardized by the daily aggregate number of bets. We also examined the number of bets to measure trajectory of gambling frequency. Results: Account closers due to gambling problems experienced increasing monetary loss as the time to closure approached; they also increased their stake per bet. Yet they did not chase longer odds; their choices of wagers were more probabilistically conservative (i.e., short odds) compared with the controls. The changes of monetary involvement and risk preference occurred concurrently during the last few days prior to voluntary closing. Conclusions: Our finding of an involvement-seeking yet risk-averse tendency among self-identified problem gamblers challenges the notion that problem gamblers seek “long odds” during “chasing.”     

Moral Schemas in Articulation and Intuition: How Religious People Evaluate Human Reproductive Genetic Technologies

As new and more effective human reproductive genetic technologies (RGTs) rapidly develop, religious voices remain an important part of public discussion about the moral standing of such technologies. Here, we compare how individuals from different religious traditions evaluate disease RGTs (detecting genetic diseases in vitro) when compared to enhancement RGTs, allowing parents to select features of a child. Findings are gleaned from analysis of 270 interviews with individuals from 23 Christian, Muslim, and Jewish religious organizations, with supporting data from a national survey of more than 10,000 Americans. We find that respondents engage in clearly defined discursive moral reasoning to evaluate the propriety of disease RGTs while moral intuitions manifest themselves in responses to enhancement RGTs. We argue that schemas provide resources for moral discourses while also shaping moral intuitions expressed through emotions. Our results have implications for how religious people respond to new technologies when their institutional and denominational structures do not have readily discernable moral frameworks to guide responses.