A practical guide to understanding reliability in studies of within-person variability

This article concerns how to estimate reliability (defined as the internal consistency of responses to a scale) in designs that are commonly used in studies of within-person variability. I present relevant issues, describe common errors, make recommendations for best practice, and discuss unresolved issues and future directions. I describe how to estimate the reliability of scales administered in studies in which observations are nested within persons, such as daily diary and “beeper” studies and studies of social interaction. Multilevel modeling analyses that include a measurement level can estimate the occasionlevel (e.g., days or beeps or interactions) reliability of scales. In such models, items on a scale are nested within occasions of measurement and occasions of measurement are nested within persons.     

Does adolescent heavier alcohol use predict young adult aggression and delinquency? Parallel analyses from four Australasian cohort studies

While the association between heavy alcohol consumption and aggression has been well documented, the causal direction of this association, particularly at a population level, is disputed. A number of causal sequences have been proposed. First, that aggression leads to heavy alcohol use. Second, that heavy alcohol use leads to aggression. Third, that the association between alcohol use and aggression is due to confounding by (a) sociodemographic variables or (b) delinquency. We report here data from four Australasian prospective longitudinal studies of adolescents, to assess the temporal sequence of heavy drinking and aggression over the period from adolescence to young adulthood. The four cohort studies provide a total sample of 6,706 persons (Australian Temperament Project, n = 1701; Christchurch Health and Development Study, n = 931; Mater-University of Queensland Study of Pregnancy, n = 2437; Victorian Adolescent Health Cohort Study, n = 1637). We use multinomial logistic regression to determine whether early adolescent aggression predicts subsequent age of onset of heavy episodic drinking (HED), after adjustment for concurrent sociodemographic factors and delinquency. We then consider whether HED predicts subsequent aggression, after adjusting for past aggression, concurrent delinquency, and a range of confounders. There are broadly consistent findings across the four cohort studies. Early aggression strongly predicts subsequent HED. HED predicts later aggression after adjustment for prior aggression and other confounders. Policies that alter population levels of alcohol consumption are likely to impact on levels of aggression in societies where HED linked to aggression is more common.     

The Road to Becoming a Psychologist: Indicators of Success and Hardship during the University Years

Abstract

In order to become a full-fledged psychologist, one must undertake a long, demanding, and quite difficult journey in academia. The academic journey holds a promise of delivering knowledge, interesting theories, and strategies on helping those who need psychological assessment and/or treatment. However, the constant expectation of keeping up with the material, of succeeding in tests and exams, and of preparing to proceed to the next educational level can be daunting and exhausting. In line with the topic of this special issue, this paper addresses factors contributing to academic success at the undergraduate, graduate, and post-graduate levels of psychology. Utilizing the available literature on the Big Five personality classification scheme, high conscientiousness was found to be the most consistent predictor of success, although curiously, this relationship was only found to be reliable at the undergraduate level. Less robust findings included high agreeableness and low neuroticism as predictors of general academic success in all tertiary levels of education. The importance of mentorship figures in psychology, and a highlight of its lack of widespread implementation at the undergraduate level, are also addressed. Additionally, we discuss the negative implications of the impostor phenomenon and of loneliness, which students at all levels may experience as common barriers to scholastic success in psychology. Following a discussion of each factor as outlined above, there is a brief literature review regarding ways that its constraining effects may be limited or its positive effects possibly enhanced.     

Problems in Psychiatric Genetic Research: A Reply to Faraone and Biederman

This article examines evidence cited in favor of the operation of genetic factors in attention-deficit hyperactivity disorder (ADHD). Like other psychiatric conditions, a belief in the genetic basis of ADHD is derived from the results of family, twin, and adoption studies. Because family studies are widely believed to be confounded by environmental factors, primary emphasis is placed on twin and adoption studies. ADHD twin studies depend on the validity of the equal environment assumption (EEA), which holds that the environments of identical (MZ) and fraternal (DZ) twins are the same. Here it is argued that however the EEA is defined, it cannot be accepted. Therefore, the greater similarity or concordance of MZ twins when compared to DZ twins is plausibly explained by environmental factors. Adoption studies constitute a third method for investigating the role of genetic factors in ADHD. It is argued that these studies are greatly flawed by factors including non blinded diagnoses and the failure to study the biological relatives of adoptees. After an examination of the total weight of evidence in favor of a genetic basis or predisposition for ADHD, it is concluded that a role for genetic factors is not supported and that future research should be directed toward psychosocial causes     

Signaling trustworthiness: The effect of leader humor on feedback-seeking behavior

ABSTRACT

Given its capacity to cultivate a range of positive outcomes in the workplace, humor has been recognized as a valuable tool for leadership purposes. However, the theoretical understanding of leader humor remains relatively limited and the mechanism through which it influences follower outcomes has not been clearly identified. Drawing on signaling theory, we developed and empirically tested a model which delineates the relationship between leader humor and a specific follower behavior – proactive feedback seeking. We collected data from 304 employees and their respective leaders working in a large Canadian retail organization. Results of our analyses indicate that leader humor can impact subordinate feedback-seeking behavior via its influence on subordinates’ affect-based and cognition-based trust in the leader.