Hypothesis Tests for Neyman's Bias in Case–Control Studies

Survival bias is a long recognized problem in case–control studies, and many varieties of bias can come under this umbrella term. We focus on one of them, termed Neyman's bias or ‘prevalence–incidence bias’. It occurs in case–control studies when exposure affects both disease and disease-induced mortality, and we give a formula for the observed, biased odds ratio under such conditions. We compare our result with previous investigations into this phenomenon and consider models under which this bias may or may not be important. Finally, we propose three hypothesis tests to identify when Neyman's bias may be present in case–control studies. We apply these tests to three data sets, one of stroke mortality, another of brain tumors, and the last of atrial fibrillation, and find some evidence of Neyman's bias in the former two cases, but not the last case.     

Ambiguity aversion in multi-armed bandit problems

In multi-armed bandit problems, information acquired from experimentation is valuable because it tells the agent whether to select a particular option again in the future. This article tests whether people undervalue this information because they are ambiguity averse, or have a distaste for uncertainty about the average quality of each alternative. It is shown that ambiguity averse agents have lower than optimal Gittins indexes, appearing to undervalue information from experimentation, but are willing to pay more than ambiguity neutral agents to learn the true mean of the payoff distribution, appearing to overvalue objectively given information. This prediction is tested with a laboratory experiment that elicits a Gittins index and a willingness to pay on six two-armed bandits. Consistent with the predictions of ambiguity aversion, the Gittins indexes are significantly lower than optimal and willingnesses to pay are significantly higher than optimal.     

Outcomes Assessment of Role-Play Scenarios for Teaching Responsible Conduct of Research

We describe the summative assessment of role-play scenarios that we previously developed to teach central topics in the responsible conduct of research (RCR) to graduate students in science and engineering. Interviews with role-play participants, with participants in a case discussion training session, and with untrained students suggested that role-playing might promote a deeper appreciation of RCR by shifting the focus away from wanting to simply “know the rules.” We also present the results of a think-aloud case analysis study and describe the development of a behaviorally-anchored rating scale (BARS) to assess participants' case analysis performance.     

Exiting the Drug-Addict Role: Variations by Race and Gender

Our paper explores race and gender variations in the processes of exiting a “drug-addict role” and in creating a “recovering-addict role” within the ideological constraints of 12-Step programs. Our method is qualitative and features in-depth interviewing with 45 currently abstinent drug addicts from the 12-Step programs of Alcoholics Anonymous (A.A.) and Narcotics Anonymous (N.A.) in the Washington, D.C., Metropolitan Area as well as a residential and out-patient treatment program in mid-Michigan. Our respondents' exit processes typically began with doubts about the drug addict role followed by an often long and dynamic period of seeking alternatives to it without giving up drugs and alcohol completely. In some cases, however, participation in a new role initiated doubts about an existing one. Contrary to extant research, turning points or epiphanic moments in existing roles were not always identified. Most importantly, however, we found many differences by race and gender in what comprised the exit process. Gender socialization, cultural diversity, and the history of race relations in the United States help to explain this diversity.     

Reviewing the Reviews: Discussions of Race by Film Reviewers

Color-blind racism has transformed how race scholars understand race relations in contemporary society. Previous researchers mainly utilized this theory to identify frames of color-blind racism in various social settings and interactions. What has received less attention, however, is how frames of color-blind racism are produced within material conditions in which social interactions and relations occur. In this study we use film reviews to exemplify how color-blind racism is produced in a specific materialist context—film reviews. Film reviews garner discussion among scholars for their impact on the box office revenues of films. Less attention is given to the content of these reviews and, particularly, how their writers address issues of race. This study provides a qualitative content analysis of film reviewer’s discussions of race in their reviews of twenty-first-century films featuring black protagonists to illuminate some ways in which mainstream and niche media outlets discuss race. Results suggest that the source of the reviews influences how race is considered and communicated among film reviewers. Mainstream reviewers differ widely from niche reviewers in both content and delivery in their discussions of race.     

Residential Mobility and Adolescent Achievement and Behavior: Understanding Timing and Extent of Mobility

Residential mobility is generally viewed as an adverse event for adolescents' development. Less is known about whether moving during adolescence, childhood, or both periods explains this connection and whether the extent of mobility matters. Analytic shortcomings with much of the research call into question extant findings. We examined associations between childhood, adolescent, and child–adolescent mobility and adolescents' achievement (math and reading) and behavior problems (internalizing and externalizing). With a multisite, longitudinal sample (N = 1,056), we employed propensity score methods, which mitigate concerns about selection bias on observed variables, to investigate relationships. Results suggest that multiple, child–adolescent movers had more internalizing problems in adolescence than their stable peers, but did not differ on externalizing problems or achievement.     

Assessment of Distraction From Erotic Stimuli by Nonerotic Interference

Distraction from erotic cues during sexual encounters is a major contributor to sexual difficulties in men and women. Being able to assess distraction in studies of sexual arousal will help clarify underlying contributions to sexual problems. The current study aimed to identify the most accurate assessment of distraction from erotic cues in healthy men (n = 29) and women (n = 38). Participants were assigned to a no distraction, low distraction, or high distraction condition. Distraction was induced using an auditory distraction task presented during the viewing of an erotic video. Attention to erotic cues was assessed using three methods: a written quiz, a visual quiz, and a self-reported distraction measure. Genital and psychological sexual responses were also measured. Self-reported distraction and written quiz scores most accurately represented the level of distraction present, while self-reported distraction also corresponded with a decrease in genital arousal. Findings support the usefulness of self-report measures in conjunction with a brief quiz on the erotic material as the most accurate and sensitive ways to simply measure experimentally-induced distraction. Insight into distraction assessment techniques will enable evaluation of naturally occurring distraction in patients suffering from sexual problems.