A framework for the analysis of self-confirming policies

Theory and Decision - This paper provides a general framework for analyzing self-confirming policies. We study self-confirming equilibria in recurrent decision problems with incomplete information...     

Selected health behaviors that influence college freshman weight change

OBJECTIVE AND PARTICIPANTS: The authors investigated the effect of physical activity (PA), fruit and vegetable intake, and alcohol use on 6-month weight change in 193 college freshmen (78.8% white, 88.2% women, 94.5% on a meal plan). METHODS: The authors administered a Web-based survey in fall 2002 (baseline) and spring 2003 (follow-up). RESULTS: There was an overall average weight gain of 2.5 lbs (p < .05), although only 57% reported weight gain (M = 7.1 lbs). Fruit and vegetable intake decreased (p = .034), alcohol use increased (p > .05), and PA was unchanged. Weight gain for students with body mass indexes (BMI) > or =25 kg/m2 was nearly twice that of students with BMIs < 25 (p < .05). Students with low-frequency baseline PA were twice as likely to be overweight. Follow-up data showed that students reporting > or = 4 sessions per week (ie, high frequency) of low-intensity PA were twice as likely to have healthy BMIs as students engaging in low- and moderate-frequency PA. CONCLUSIONS: PA interventions should target freshmen with BMIs > or = 25.     

A Flexible Approach to Time-varying Coefficients in the Cox Regression Setting

Research on methods for studying time-to-event data (survival analysis) has been extensive in recent years. The basic model in use today represents the hazard function for an individual through a proportional hazards model (Cox, 1972). Typically, it is assumed that a covariate's effect on the hazard function is constant throughout the course of the study. In this paper we propose a method to allow for possible deviations from the standard Cox model, by allowing the effect of a covariate to vary over time. This method is based on a dynamic linear model. We present our method in terms of a Bayesian hierarchical model. We fit the model to the data using Markov chain Monte Carlo methods. Finally, we illustrate the approach with several examples. This revised version was published online in July 2006 with corrections to the Cover Date.     

Infants born preterm and infants born full-term generate more selective leg joint movement during the scaffolded mobile task

Infants born very preterm (PT), prior to 32 weeks gestation, are at increased risk of developing cerebral palsy. Children with spastic cerebral palsy have impaired selective leg joint movement, which contributes to lifelong walking limitations. We investigated whether infants born PT generated more selective hip–knee joint movement (e.g., hip flexes as knee extends) while participating in a scaffolded mobile task. Infants born PT and infants born full-term (FT) at 4 months corrected age participated in a scaffolded mobile task for 2–3 consecutive days. The scaffolded mobile task required infants to raise their legs vertically over a virtual threshold. Three threshold heights (low, middle, and high) were used to test whether the middle and high heights encourage infants to move their legs more selectively. Fifteen infants born FT learned the task and showed more selective hip–knee movement at each of the three threshold heights on the day that they learned, compared with their baseline spontaneous kicking. Thirteen infants born PT learned the task and showed more selective hip–knee movement on their learning day, but only when the middle and high thresholds were used. The results show that the scaffolded mobile task effectively encouraged infants to generate more selective hip–knee joint movement.     

Helping children cope with parental mental illness through use of children's literature

Children of mentally ill parents are often vulnerable, partly because they may not receive adequate nurturing and partly because they feel stigmatized by their parents' disabilities. The author recommends use in treatment of several children's books that show realistic, positive role models of children coping with parental mental illness.     

An empirical analysis of the use of the Herfindahl-Hirschman Index in assessing the distribution of electronic gaming machines and its socio-economic implications

Sargent and Holmes (2014) proposed the use of the Herfindahl-Hirschman Index in assessing the effects of the distribution of electronic gaming machines (EGMs) on expenditure and tax outcomes for local areas. This paper reports empirical analysis on the use of the Herfindahl Hirschman Index (HHI) in this application. Comparative testing of HHI and population-based measures, such as EGM density, was conducted using EGM data from the New South Wales State Government (Australia) for the period 1995 to 2005. The analysis also compares the use of the commonly used Australian Bureau of Statistics’ (ABS) Socio-Economic Indexes for Areas (SEIFA) Index of Relative Socio-Economic Disadvantage, with the Index of Education and Occupation. The socio-economic elements comprising the latter index are acknowledged as being relevant to the assessment of gambling impacts. The results indicate that the use of a concentration measure such as the HHI may augment the use of existing measures in policy development and localized decision-making on distribution of gambling facilities.     

The gendered pandemic: The implications of COVID-19 for work and family

The COVID-19 pandemic has affected nearly all the aspects of society since it's onset in early 2020. In addition to infecting and taking the lives of millions of global citizens, the pandemic has fundamentally changed family and work patterns. The pandemic and associated mitigation measures have increased the unemployment rates, amplified health risks for essential workers required to work on-site, and led to unprecedented rates of telecommuting. Additionally, due to school/daycare closures and social distancing, many parents have lost access to institutional and informal childcare support during the COVID-19 crisis. Such losses in childcare support have significantly impacted the paid and unpaid labor of parents, particularly of mothers. In this article, we synthesize recent research on pandemic-related changes to work and family in the United States. Applying an intersectionality lens, we discuss the gendered implications of these changes. Because gender inequality in family and work are connected, COVID-19 has, in many cases, deepened the pre-existing gender inequalities in both realms.     

The moderating role of social support in Karasek's job strain model

This paper examines whether social support is a boundary-determining criterion in the job strain model of Karasek (1979). The particular focus is the extent to which different sources of social support, work overload and task control influence job satisfaction, depersonalization and supervisor assessments of work performance. Hypotheses are tested using prospective survey data from 80 clerical staff in a university setting. Results revealed 3-way interactions among levels of support (supervisor, co-worker, non-work), perceived task control and work overload on levels of work performance and employee adjustment (self-report). After controlling for levels of negative affect in all analyses, there was evidence that high levels of supervisor support mitigated against the negative effects of high strain jobs on levels of job satisfaction and reduced reported levels of depersonalization. Moreover, high levels of non-work support and co-worker support also mitigated against the negative effects of high strain jobs on levels of work performance. The results are discussed in terms of the importance of social support networks both at, and beyond, the work context.     

Infants born full term and preterm increase the height of anti-gravity leg movements during a kick-activated mobile task using a scaffolded task environment

Prior research supports that infants born very preterm (PT), compared with full term (FT), have early differences in rate of learning and motor control that may hinder their ability to learn challenging motor tasks. Four-month-old infants born FT (n = 18) and PT (n = 18) participated in an infant kick-activated mobile task that was scaffolded to motivate progressively higher kicks. We found the FT group learned the association between their leg movements and mobile activation on the second day, but the PT group learned the association on the third day. Both groups of infants increased the height of their kicks on the day they learned the task, compared with their spontaneous kicking height. These findings suggest that infants born PT have the ability to learn challenging motor tasks, such as kicking high, when participating in a task environment that uses scaffolding.