Externalizing Problem Behavior in Adolescence: Parenting Interacting With DAT1 and DRD4 Genes

This study extends previous gene‐by‐environment (G × E) research through design and methodological advances and examines alternative hypotheses of diathesis stress, vantage sensitivity, and differential susceptibility. In a sample of 984 adolescents and their parents, we examined whether effects of parental support, proactive, punitive, harsh punitive, and psychological control on externalizing problem behavior are moderated by adolescents' genotype for the dopamine transporter (DAT1) or receptor D4 (DRD4) gene. Results provided evidence for main effects of parenting behavior and DRD4, and multiple interaction effects of which one survived Bonferroni correction. Adolescents carrying a long DRD4 variant were more susceptible to the effects of parental proactive control on aggression, for better and for worse. Critical considerations were made regarding the complexity of G × E research.     

The Development of Anticipatory Postural Adjustments in Infancy

Efficient voluntary action requires postural adjustments that compensate for potential balance disturbances before they occur. These anticipatory postural adjustments have been widely investigated in adults, but relatively little is known about their development, especially during infancy. This study examined the early development of anticipatory postural activity in support of pulling action while standing. A total of 34 infants between 10 and 17 months were tested. The task required infants to open a cabinet drawer to retrieve toys while a force resisting the pulling action was applied to the drawer. The experiment included between 9 and 13 pulling trials. The force resisting the pull was doubled after the first 4 initial trials and returned again to its original value after another 4 trials. Electromyographic activity from the gastrocnemius and biceps brachii muscles was recorded. The proportion of pulls involving anticipatory activity in the gastrocnemius muscles progressively increased between 10 and 17 months. In addition, infants with considerable experience in opening drawers learned to recruit greater strength of their anticipatory postural adjustments for heavier pulls. Implications for the role of motoric experience in anticipatory postural activity are discussed.     

Infants' Evolving Representations of Object Motion During Occlusion: A Longitudinal Study of 6‐ to 12‐Month‐Old Infants

Infants' ability to track temporarily occluded objects that moved on circular trajectories was investigated in 20 infants using a longitudinal design. They were first seen at 6 months and then every 2nd month until the end of their 1st year. Infants were presented with occlusion events covering 20% of the target's trajectory (effective occlusion interval ranged from 500–4,000 msec). Gaze was measured using an ASL 504 infrared eye‐tracking system. Results effectively demonstrate that infants from 6 months of age can represent the spatiotemporal dynamics of occluded objects. Infants at all ages tested were able to predict, under certain conditions, when and where the object would reappear after occlusion. They moved gaze accurately to the position where the object was going to reappear and scaled their timing to the current occlusion duration. The average rate of predictive gaze crossings increased with occlusion duration. These results are discussed as a 2‐factor process. Successful predictions are dependent on strong representations, themselves dependent on the richness of information available during encoding and graded representations.     

On Regression Analysis with Data Cleaning via Trimming,Winsorization, and Dichotomization

ABSTRACT

In a two-variable regression model setup, we examine in this paper the effects of trimming and winsorization and dichotomization of the independent variable on the regression estimates and the efficiency of the regression estimation. These results have direct implications in the accounting literature when dealing with the effects of analyst forecast errors on stock returns.     

Alternative Approximations to Value-At-Risk: A Comparison

This article compares three value-at-risk (VaR) approximation methods suggested in the literature: Cornish and Fisher (1937 Cornish, E.A., Fisher, R.A. (1937). Moments and cumulants in the specification of distributions. Revue de l’Institut International de Statistique 5:307–320.[Crossref] , [Google Scholar]), Sillitto (1969 Sillitto, G.P. (1969). Derivation of approximants to the inverse distribution function of a continuous univariate population from the order statistics of a sample. Biometrika 56:641–650.[Crossref], [Web of Science ®] , [Google Scholar]), and Liu (2010 Liu, W.-H. (2010). Estimation and testing of portfolio value-at-risk based on L-comoment matrices. Journal of Futures Markets 30:897–908.[Crossref], [Web of Science ®] , [Google Scholar]). Simulation results are obtained for three families of distributions: student-t, skewed-normal, and skewed-t. We recommend the Sillitto approximation as the best method to evaluate the VaR when the financial return has an unknown, skewed, and heavy-tailed distribution.     

美国顾客满意度指数

顾客满意度指数作为一种新的业绩衡量方法,能够从市场角度对公司、行业、国民经济中的各个部门以及整体国民经济进行测评.首先介绍了美国顾客满意度指数(ACSI)产生的背景;然后研究了ACSI模型建立的前提、模型结构及测评方法;最后对ACSI的测评结果进行分析,得出相应结论,并以此为公共决策、管理、个体顾客和整个营销提供丰富的信息.     

Pawns or Pioneers? The Logic of User Participation in Anti‐poverty Policy‐making in Public Policy Units in Belgium

Since anti‐poverty policy‐making in Belgium is embedded in a logic of user participation, social policy has shown interest in employing users with experience of poverty as experts in public policy units in order to implement and monitor anti‐poverty policies. In this article, we discuss this recent development as a relevant case for contemporary public service delivery in the European context. In the light of the ambiguous practices of user participation in Belgium, the enacted logic of involving service users in public service delivery is discussed, and potential risks and opportunities identified: do these individuals function as pawns or as pioneers? In search of opportunities for the implementation of anti‐poverty policies, we explore different ways in which public policy units can act upon the participation of employed service users in public service delivery. On the level of public service delivery, we argue that the participation of expert users risks their use as a mere blind, de‐responsibilizing those who work in public policy units in providing high‐quality services and being responsive to all service users including those living in poverty. On the level of these individual experts, we argue that the employed service users risk becoming pawns, acquiring a tragic‐optimistic outlook on life. We conclude that enabling service users to participate as pioneers requires the joint and mutual responsibility of the employed service users and those who work in public policy units for implementing and monitoring anti‐poverty strategies rather than exclusive responsibility assigned to individual service users.