Probabilistic Subset Conjunction

The authors introduce subset conjunction as a classification rule by which an acceptable alternative must satisfy some minimum number of criteria. The rule subsumes conjunctive and disjunctive decision strategies as special cases. Subset conjunction can be represented in a binary-response model, for example, in a logistic regression, using only main effects or only interaction effects. This results in a confounding of the main and interaction effects when there is little or no response error. With greater response error, a logistic regression, even if it gives a good fit to data, can produce parameter estimates that do not reflect the underlying decision process. The authors propose a model in which the binary classification of alternatives into acceptable/unacceptable categories is based on a probabilistic implementation of a subset-conjunctive process. The satisfaction of decision criteria biases the odds toward one outcome or the other. The authors then describe a two-stage choice model in which a (possibly large) set of alternatives is first reduced using a subset-conjunctive rule, after which an alternative is selected from this reduced set of items. They describe methods for estimating the unobserved consideration probabilities from classification and choice data, and illustrate the use of the models for cancer diagnosis and consumer choice. They report the results of simulations investigating estimation accuracy, incidence of local optima, and model fit. The authors thank the Editor, the Associate Editor, and three anonymous reviewers for their constructive suggestions, and also thank Asim Ansari and Raghuram Iyengar for their helpful comments. They also thank Sawtooth Software, McKinsey and Company, and Intelliquest for providing the PC choice data, and the University of Wisconsin for making the breast-cancer data available at the machine learning archives.     

Bayesian factor analysis for multilevel binary observations

Multilevel covariance structure models have become increasingly popular in the psychometric literature in the past few years to account for population heterogeneity and complex study designs. We develop practical simulation based procedures for Bayesian inference of multilevel binary factor analysis models. We illustrate how Markov Chain Monte Carlo procedures such as Gibbs sampling and Metropolis-Hastings methods can be used to perform Bayesian inference, model checking and model comparison without the need for multidimensional numerical integration. We illustrate the proposed estimation methods using three simulation studies and an application involving student's achievement results in different areas of mathematics. The authors thank Ian Westbury, University of Illinois at Urbana Champaign for kindly providing the SIMS data for the application.     

Parental Support and Adolescent Motivation for Dieting: The Self-Determination Theory Perspective

This article focuses on parents’ role in overweight adolescents’ motivation to diet and successful weight loss. The study employed Self-Determination Theory (SDT) as the theoretical framework (Deci & Ryan, 2000, 2011). Ninety-nine participants (ages 20–30) who had been overweight during adolescence according to their Body Mass Index (BMI mean = 25, SD = 1.6), completed retrospective questionnaires about their motivation to diet and their parents’ behavior in the context of dieting. Findings from a structural equation modeling analysis suggested that participants who viewed their parents’ as more need-supportive demonstrated more autonomous motivation to diet, which, in turn, contributed to their successful weight loss. The findings highlight the importance of parental support of adolescents’ psychological needs in the quality of their motivation to diet. This is an important insight for parents and professionals who aim to encourage more constructive parent involvement in adolescents’ dieting and well-being.     

The factor structure of the Social Axioms Survey II (SASII) in the South African context

The objective of this study was to validate the new Social Axioms Survey II (SASII). The study sample comprised university students (n = 793) as well as their family members and friends (n = 645). Confirmatory factor analysis (CFA) following an initial exploratory factor analysis yielded a five-factor model: social cynicism, social complexity, reward for application, religiosity, and fate control. The findings of this study support the use of the new SASII in South Africa for research purposes.     

The Reinforcing Value of Lottery Tickets,and the Synergetic Effect of Distinct Reinforcements

We present two experiments that explore the reinforcing value of lottery tickets. Participants are faced with a repeated choice task between a safe alternative and a risky prospect that provides a chance to win a lottery ticket to be played at the end of the study. Study 1 considers situations in which the risky option leads to a slightly higher expected value than the safe alternative. It shows that the risk‐taking rate increases with the probability to win the lottery ticket, but it is below 50% even when this probability is high. Study 2 shows limited sensitivity to the expected value of the risky prospect. The results can be explained with the assumption that participants rely on small samples of past experiences, and that their reaction to lottery tickets reflects large variability. The relationship between the current results and previous research on the synergetic effect of distinct reinforcements and the “pat on the back paradox” is discussed. Copyright © 2016 John Wiley & Sons, Ltd.     

A group just like me: The moderating role of conservation values on social projection

We examined the moderating role of personal values on social projection. Study 1 was conducted prior to the 1999 Israeli elections among activists of the Center party, a newly established centrist party. The more importance activists attributed to conservation values (values that emphasize stability and certainty) the more they projected their political views to their party. Study 2 was conducted prior to the 2003 Israeli elections among students with varied attitudes toward the Kadima party, another newly established centrist party. Conservation values interacted with support for the Kadima party in their effect on social projection: The more importance participants attributed to conservation values, the more positive was the relationship between support for the party and social projection. In Study 3, we examined the role of conservation values in an experimental study in which participants were members of a virtual team: Raising the accessibility of conservation values resulted in higher levels of social projection. Taken together, findings indicate that emphasizing conservation values leads to greater social projection. Copyright © 2009 John Wiley & Sons, Ltd.     

Personal Value Priorities and National Identification

We examine relations of personal value priorities to identification with one's nation. We hypothesize that relations of values to identification depend on the motivations that can be attained by identifying with a nation. Study 1 confirmed the hypothesis that identification with one's nation correlates positively with conservation values and negatively with openness to change values in Israel and the USA. Moreover, values predicted identification with the nation above and beyond Right‐Wing Authoritarianism. Study 2 showed that increasing the salience of conservation values produced higher identification with Israel, whereas increasing the salience of openness to change values produced lower identification. Study 3 tested the hypothesis that when identification with a national group conflicts with social expectations it has different, even reversed relations with value priorities. We examined identification of recent immigrants to Israel. The more pressure immigrants felt to assimilate, the more positive the correlation of conservation values with identification with the country of residence (Israel) and the more negative the correlation of conservation values with identification with the country of origin (Russia). Taken together, the findings point to the utility of values in revealing the motivational functions of identification with a nation.     

Not All Great Minds Think Alike: Systematic and Intuitive Cognitive Styles

Individuals process information and make decisions in different ways. Some plan carefully and analyze information systematically, whereas others follow their instincts and do what “feels right.” We aimed to deepen our understanding of the meaning of the intuitive versus systematic cognitive styles. Study 1 (N = 130, 39% female, M_age = 24) compared cognitive styles of arts, accounting, and mathematics students. Cognitive styles were associated with values (Study 2: N = 154, 123, 78; female = 59%, 49%, 85.9%; M_age = 22, 23, 27) and traits (Study 3: N = 77, 140, 151; female = 59%, 66%, 46%; M_age = 22, 25, 23), and they interacted with experience in predicting performance (Study 4: N = 63, 48% female, M_age = 23; Study 5: N = 44, 39% female, M_age = 23). All participants were Caucasian Israeli students. The systematic style was most frequent among accountants, and the intuitive style was most frequent among artists, validating the meaning of the styles. Systematic style was positively correlated with Conscientiousness and with security values and negatively correlated with stimulation values. The intuitive style had the opposite pattern and was also positively correlated with Extraversion. Experience improved rule‐based performance among systematic individuals but had no effect on intuitive ones. Cognitive style is consistent with other personal attributes (traits and values), with implications for decision making and task performance.