A stochastic model of consideration set sizes

This paper proposes a new model of consideration set sizes, which relies on a stochastic modelling approach to better understand data patterns. The paper combines the Poisson distribution with the lognormal distribution proposed by Hauser and Wernerfelt (1990) to create the Poisson lognormal (PLN) model of consideration set sizes. An advantage of PLN is that it allows variance within a given individual consumer. This is a crucial factor for brand managers who wish to choose a particular market to promote their brand, as a higher within‐individual variance suggests that there is more chance for a consumer to change their consideration set size, whereas a lower within‐individual variance indicates that a consumer tends to stick to his/her consideration set size. The paper then uses 10 datasets including service, durable and fast‐moving consumer goods across four countries to validate the new model and compare it with the lognormal model. The results show that PLN gives a good fit to these data. It outperforms the lognormal model. The average mean absolute percentage error of the PLN model is 12 per cent, whereas that of the lognormal model is 26 per cent. For managerial implications, the paper proposes a better tool to help brand managers analyse the nature and intensity of competition that is facing their brands. Also, relying on its stochastic element, the proposed model can help brand managers predict future brand consideration by their consumers, as well as evaluate any change in brand consideration, caused by marketing activity such as sales promotion and advertising. Copyright © 2014 John Wiley & Sons, Ltd.     

The role of moral commitment within the Investment Model

The Investment Model (Rusbult, 1980) defines general commitment as a long‐term orientation towards relationship maintenance and feelings of psychological attachment, influenced by satisfaction, quality of alternatives and intrinsic/extrinsic investments. We suggest the importance of additionally assessing moral commitment, defined by an intrapersonal predisposition to remain in the relationship (Johnson, 1991). We argue moral commitment's association to perceived intrinsic investments acting as internal barriers influencing general commitment and promoting relationship maintenance. A correlational study resorting to structural equation modelling showed that moral commitment predicted intrinsic investments, which in turn predicted general commitment (Model 1). No direct paths emerged from moral commitment to satisfaction or quality of alternatives (Model 2), nor it emerged as a fourth direct predictor of general commitment (Model 3). Results are discussed under relationships maintenance and dissolution frameworks.     

Executive function and psychosocial adjustment in healthy children and adolescents: A latent variable modelling investigation

The objective of this study was to establish latent executive function (EF) and psychosocial adjustment factor structure, to examine associations between EF and psychosocial adjustment, and to explore potential development differences in EF-psychosocial adjustment associations in healthy children and adolescents. Using data from the multisite National Institutes of Health (NIH) magnetic resonance imaging (MRI) Study of Normal Brain Development, the current investigation examined latent associations between theoretically and empirically derived EF factors and emotional and behavioral adjustment measures in a large, nationally representative sample of children and adolescents (7–18 years old; N = 352). Confirmatory factor analysis (CFA) was the primary method of data analysis. CFA results revealed that, in the whole sample, the proposed five-factor model (Working Memory, Shifting, Verbal Fluency, Externalizing, and Internalizing) provided a close fit to the data, χ²(66) = 114.48, p < .001; RMSEA = .046; NNFI = .973; CFI = .980. Significant negative associations were demonstrated between Externalizing and both Working Memory and Verbal Fluency (p < .01) factors. A series of increasingly restrictive tests led to the rejection of the hypothesis of invariance, thereby precluding formal statistical examination of age-related differences in latent EF-psychosocial adjustment associations. Findings indicate that childhood EF skills are best conceptualized as a constellation of interconnected yet distinguishable cognitive self-regulatory skills. Individual differences in certain domains of EF track meaningfully and in expected directions with emotional and behavioral adjustment indices. Externalizing behaviors, in particular, are associated with latent Working Memory and Verbal Fluency factors.     

Psychological ownership in relation to workplace trust and turnover intent

The study investigated the relationship between workplace trust, psychological ownership and turnover intent within a South African professional services organisation. A cross-sectional quantitative survey design was used to collect data from a purposive sample (n = 302) of skilled, highly skilled and professional employees in a professional services industry. The participants completed the Psychological Ownership Questionnaire, Workplace Trust Survey, and Turnover Intentions Scale. The results from structural equation modelling (SEM) suggest psychological ownership to be significantly related to workplace trust (positively) and turnover intent (negatively). In addition, the findings indicate psychological ownership to fully mediate the relationship between workplace trust and turnover intent. By implication, work environments that fostered workplace trust would increase the level of psychological ownership that employees’ experienced, which, in turn, would reduce employees’ intent to leave their workplace.     

父母卷入在家庭社会经济地位与学业成就间的中介作用:元分析结构方程模型

以22项实证研究(25个独立样本,79665个被试)为对象,综合使用元分析和结构方程模型,以家庭投资模型和家庭压力模型为理论基础,探讨了家庭社会经济地位对学业成就的影响及内在机制。结果发现:(1)家庭社会经济地位能显著地正向预测学业成就(r=0.32);(2)家庭社会经济地位测量方式的调节效应显著;(3)父母卷入在家庭社会经济地位与学业成就间起着部分中介作用;(4)父母卷入的中介效应只存在于小学及以下群体,在中学群体中介效应不显著。结论,家庭社会经济地位与学业成就之间存在显著正相关,在小学和幼儿园阶段时父母卷入在家庭社会经济地位和学业成就间起着部分中介作用。     

The Parallel Episodic Processing (PEP) model 2.0: A single computational model of stimulus-response binding,contingency learning,power curves,and mixing costs

The current paper presents an extension of the Parallel Episodic Processing model. The model is developed for simulating behaviour in performance (i.e., speeded response time) tasks and learns to anticipate both how and when to respond based on retrieval of memories of previous trials. With one fixed parameter set, the model is shown to successfully simulate a wide range of different findings. These include: practice curves in the Stroop paradigm, contingency learning effects, learning acquisition curves, stimulus-response binding effects, mixing costs, and various findings from the attentional control domain. The results demonstrate several important points. First, the same retrieval mechanism parsimoniously explains stimulus-response binding, contingency learning, and practice effects. Second, as performance improves with practice, any effects will shrink with it. Third, a model of simple learning processes is sufficient to explain phenomena that are typically (but perhaps incorrectly) interpreted in terms of higher-order control processes. More generally, we argue that computational models with a fixed parameter set and wider breadth should be preferred over those that are restricted to a narrow set of phenomena.     

The safety performance of connected vehicles on slippery horizontal curves through enhancing truck drivers’ situational awareness: A driving simulator experiment

Although drivers can adequately adjust their operating speed according to the road curvature, they show a lack of recognition regarding the pavement friction conditions. In this regard, inappropriate speed selection on Horizontal Curves (HCs) with reduced surface friction can lead to a remarkable rate of run-off-road, sideswipe, head-on, and rollover crashes, especially on rural highways. Aligned with the Connected Vehicle (CV) Pilot Program on Interstate-80 in Wyoming, this study scrutinizes how CV advisory/warning messages can enhance traffic safety on slippery HCs. To this aim, a roadway consists of two HCs with regular and slippery pavement conditions was designed in a high-fidelity driving simulator experiment. A total of 24 professional truck drivers were recruited to drive the simulated roadway under CV and non-CV environments. In the CV scenario, drivers were informed about the pavement conditions and the advisory speeds before entering HCs. In contrast, no messages were given to non-CV drivers. Truck drivers' behaviors in both scenarios were quantified using four Kinematic-based Surrogate Measures of Safety (K-SMoS), including deviation from the pathway, instantaneous acceleration, lateral speed, and steering angle. CVs’ trajectories were statistically compared to non-CVs in terms of the central tendency and dispersion using the Wilcoxon Signed-Rank Test (WSRT) and Median Absolute Deviation (MAD), respectively. The results of WSRT depicted, under the effect of CV advisory/warning messages and throughout the slippery HC, the central tendency of four K-SMoS could be shifted toward zero by 23% up to 99%. This shifting is associated with a significant safety enhancement that potentially can reduce the likelihood of curve-related crashes on slippery HCs. It was revealed that the variation in drivers’ behavior on the slippery HC could be minimized in the CV environment, where 54% up to 95% reduction in the dispersions of four K-SMoS were observed, leading to more certainty in drivers’ behavior.     

Hard-working in general but lazy at home? Generalized Big Five traits and relationship-specific traits in romantic couples over time

To acknowledge the significance of contexts for personality, this study focused on personality in romantic relationships and the concept of relationship-specific traits. Specifically, we were interested in how relationship-specific traits (i.e., how people report to be in their relationship) relate to generalized Big Five traits, and whether both constructs codevelop over time. We computed dyadic bivariate latent growth curve models, using data from 551 couples (M_age = 32.23 years) over 1 year. The findings indicated that generalized traits and relationship-specific traits were positively correlated in their intercepts but did not codevelop over time. Furthermore, baseline relationship satisfaction explained variance in traits, particularly in relationship-specific traits. These findings have implications for how to study personality development in the romantic relationship context.     

A Model of Intention to Participate in Parenting Interventions: The Role of Parent Cognitions and Behaviors

A wide range of factors, from perceived child behavior problems to sociocultural factors, have been identified as impacting the engagement of parents in parenting interventions. However, parents’ cognitions and behaviors have not been evaluated sufficiently to understand their role in initial parental engagement. The current study aimed to examine why some parents are more likely to want to participate in parenting programs and how their cognitions and behaviors are related to their intention to participate in future parenting interventions. We tested the hypothesised model of parental factors on intention to participate using structural equation modelling (SEM) in AMOS. This study (N = 6,733) analyzed existing data from the International Parenting Survey (IPS), a web-based tool developed to collect information about parents’ views on family and parenting at a population level in several countries. Results showed that parents’ coercive parenting, parental consistency, positive encouragement, relationship with their child, parental self-efficacy, psychological distress, and help-seeking behaviors were significantly related to their intention to participate in future parenting interventions. The structural model of parents’ cognitions and behaviors explained 16% of the variance in intention to participate. Although the current model explained a small but significant percentage of the variance, it expands existing understanding regarding parental cognitions and behaviors and their relationship to intention. Implications for further research and engagement practice are discussed.