Maximum Marginal Likelihood Estimation of a Monotonic Polynomial Generalized Partial Credit Model with Applications to Multiple Group Analysis

We present a semi-parametric approach to estimating item response functions (IRF) useful when the true IRF does not strictly follow commonly used functions. Our approach replaces the linear predictor of the generalized partial credit model with a monotonic polynomial. The model includes the regular generalized partial credit model at the lowest order polynomial. Our approach extends Liang’s (A semi-parametric approach to estimate IRFs, Unpublished doctoral dissertation, 2007) method for dichotomous item responses to the case of polytomous data. Furthermore, item parameter estimation is implemented with maximum marginal likelihood using the Bock–Aitkin EM algorithm, thereby facilitating multiple group analyses useful in operational settings. Our approach is demonstrated on both educational and psychological data. We present simulation results comparing our approach to more standard IRF estimation approaches and other non-parametric and semi-parametric alternatives.     

Higher cortisol is associated with poorer executive functioning in preschool children: The role of parenting stress,parent coping and quality of daycare

Child executive functions (cognitive flexibility, inhibitory control, working memory) are key to success in school. Cortisol, the primary stress hormone, is known to affect cognition; however, there is limited information about how child cortisol levels, parenting factors and child care context relate to executive functions in young children. The aim of this study was to examine relationships between child cortisol, parenting stress, parent coping, and daycare quality in relation to executive functions in children aged 3–5 years. We hypothesized that (1) poorer executive functioning would be related to higher child cortisol and higher parenting stress, and (2) positive daycare quality and positive parent coping style would buffer the effects of child cortisol and parenting stress on executive functions. A total of 101 children (53 girls, 48 boys, mean age 4.24 years ±0.74) with complete data on all measures were included. Three saliva samples to measure cortisol were collected at the child’s daycare/preschool in one morning. Parents completed the Behavior Rating Inventory of Executive Function – Preschool Version (BRIEF-P), Parenting Stress Index (PSI), and Ways of Coping Questionnaire (WCQ). The Early Childhood Environment Rating Scale – Revised (ECERS-R) was used to measure the quality of daycare. It was found that children with poorer executive functioning had higher levels of salivary cortisol, and their parents reported higher parenting stress. However, parent coping style and quality of daycare did not modulate these relationships. Identifying ways to promote child executive functioning is an important direction for improving school readiness.     

Reasons Explanation: Further Defense of a Non-causal Account

If moral responsibility requires uncaused action, as I believe, and if a reasons explanation of an action must be a causal explanation, as many philosophers of action suppose, then it follows that our responsible actions are ones we do for no reason, which is preposterous. In previous work I have argued against the second premise of this deduction, claiming that the statement that a person did A in order to satisfy their desire D will be true if the person, while doing A, intended of that action that it contribute to satisfying their desire D, a condition that does not entail any causal connection between the explaining desire and the explained action. This claim has received trenchant criticism from Randolph Clarke. The main part of the present paper responds to Clarke’s latest objections. The rest of the paper addresses another worry about my account (not raised by Clarke): does my non-causal sufficient condition hold as widely as it needs to if responsible, uncaused actions are as widespread as we would like to think?     

Rebound or Resignation: Developing a Predictive Model of Return to Subjective Wellbeing Set-Point

Though subjective wellbeing (SWB) is generally stable and consistent over time, it can fall below its set-point in response to adverse life events. However, deviations from set-point levels are usually only temporary, as homeostatic processes operate to return SWB to its normal state. Given that income and close interpersonal relationships have been proposed as powerful external resources that are coincident with higher SWB, access to these resources may be an important predictor of whether or not a person is likely to recover their SWB following a departure from their set-point. Under the guiding framework of SWB Homeostasis Theory, this study considers whether access to a higher income and a committed partner can predict whether people who score lower than normal for SWB at baseline will return to normal set-point levels of SWB (rebound) or remain below the normal range (resigned) at follow-up. Participants were 733 people (53.3 % female) from the Australian Unity Longitudinal Wellbeing Study who ranged in age from 20 to 92 years (M = 59.65 years; SD = 13.15). Logistic regression analyses revealed that participants’ demographic characteristics were poor predictors of whether they rebounded or resigned. Consistent with homeostasis theory, the extent of departure from the proposed normal SWB set-point at baseline was significantly associated with rebound or resignation at time 2. These findings have implications for the way that SWB measures can be used in professional practice to identify people who are particularly vulnerable to depression and to guide the provision of appropriate and effective therapeutic interventions.     

Stability in the metamemory realism of eyewitness confidence judgments

The stability of eyewitness confidence judgments over time in regard to their reported memory and accuracy of these judgments is of interest in forensic contexts because witnesses are often interviewed many times. The present study investigated the stability of the confidence judgments of memory reports of a witnessed event and of the accuracy of these judgments over three occasions, each separated by 1 week. Three age groups were studied: younger children (8–9 years), older children (10–11 years), and adults (19–31 years). A total of 93 participants viewed a short film clip and were asked to answer directed two-alternative forced-choice questions about the film clip and to confidence judge each answer. Different questions about details in the film clip were used on each of the three test occasions. Confidence as such did not exhibit stability over time on an individual basis. However, the difference between confidence and proportion correct did exhibit stability across time, in terms of both over/underconfidence and calibration. With respect to age, the adults and older children exhibited more stability than the younger children for calibration. Furthermore, some support for instability was found with respect to the difference between the average confidence level for correct and incorrect answers (slope). Unexpectedly, however, the younger children’s slope was found to be more stable than the adults. Compared to the previous research, the present study’s use of more advanced statistical methods provides a more nuanced understanding of the stability of confidence judgments in the eyewitness reports of children and adults.     

Subtle cognitive deficits in severe alcohol addicts – Do they show a specific profile?

Although alcohol dependency is a burden to society, data on cognitive performance in therapy‐resistant patients after multiple withdrawals are poor. In this study, 22 patients without reported cognitive deficits and 20 control subjects performed extensive cognitive testing and a motor task assessing short‐term memory. Patients displayed subtle deficits (mainly in executive function), while memory functions were relatively unimpaired. Our results suggest that subtle frontal‐executive deficits may contribute to a poor prognosis, but could be missed by routine clinical tests.     

Soldiers’ perspectives of the Married Army Couples Program: A review of perceived problems and proposed solutions

The current study investigated soldiers’ perceptions of the Married Army Couples Program (MACP) using data from focus groups conducted with Army personnel in dual-military marriages. Despite the high success rate of the program (approximately 80–83%)—success being defined as establishment of a joint domicile within a 50-mile radius of each spouse’s duty station—a variety of difficulties were reported as well as consequent negative perceptions. Problems included dissatisfaction with the parameters defining joint domicile, obstacles to career advancement, lack of quality information regarding the program, and unequal allocation depending on one’s level of leadership support. Difficulties with MACP led to negative impressions of the program and of the Army as a whole. Specifically, when asked about challenges related to the program, many participants reported perceptions of a poorly functioning program, an uncaring environment, and of the Army as a hypocritical institution. For individuals in dual-military marriages, these difficulties affect quality of life. For the institution, these negative perceptions can potentially lead to problems with retention of one or both members of a dual-military couple. We propose several strategies to improve the effectiveness of MACP and to increase positive perceptions of the program based on suggestions from the focus groups in addition to the military and work literatures.