Competence effects for choices involving gains and losses

We investigate how choices for uncertain gain and loss prospects are affected by the decision maker’s perceived level of knowledge about the underlying domain of uncertainty. Specifically, we test whether Heath and Tversky’s (J Risk Uncertain 4:5–28, 1991) competence hypothesis extends from gains to losses. We predict that the commonly-observed preference for high knowledge over low knowledge prospects for gains reverses for losses. We employ an empirical setup in which participants make hypothetical choices between gain or loss prospects in which the outcome depends on whether a high or low knowledge event occurs. We infer decision weighting functions for high and low knowledge events from choices using a representative agent preference model. For gains, we replicate the results of Kilka and Weber (Manage Sci 47:1712–1726, 2001), finding that decision makers are more attracted to choices that they feel more knowledgeable about. However, for losses, we find limited support for our extension of the competence effect.     

Performance of coefficient of variation estimators in ranked set sampling

In this paper, we propose and evaluate the performance of different parametric and nonparametric estimators for the population coefficient of variation considering Ranked Set Sampling (RSS) under normal distribution. The performance of the proposed estimators was assessed based on the bias and relative efficiency provided by a Monte Carlo simulation study. An application in anthropometric measurements data from a human population is also presented. The results showed that the proposed estimators via RSS present an expressively lower mean squared error when compared to the usual estimator, obtained via Simple Random Sampling. Also, it was verified the superiority of the maximum likelihood estimator, given the necessary assumptions of normality and perfect ranking are met.     

Heterogeneous Perspectives in Coalitions and Community-Based Responses to Sex Trafficking and Commercial Sexual Exploitation: Implications for Practice

ABSTRACT

Despite increases in community-based coalitions to address sex trafficking and commercial sexual exploitation (CSE), and the coinciding ideological debates surrounding sexual commerce, few studies have examined the dynamics between and perspectives among coalition members. This paper aims to explore 1) coalition members' perspectives on religion, politics, feminism, sex trafficking/sex work, neoliberalism/neo-abolitionism and 2) the impacts of such perspectives on coalition members' anti-trafficking/CSE work. Drawing from a larger qualitative study, 24 in-depth semi-structured interviews were conducted with current and former coalition members in an urban Midwestern city. Findings suggest varied religious identities, which challenged some providers in coordinating services for the lesbian gay bisexual transgender queer/questioning (LGBTQ) community or women with a history of or considering abortions. Providers generally identified as democrat as well as feminist in some way, but had conflicting views of sexual commerce. These competing ideologies created challenges for cohesive coalition action. Consequently, it may be essential to facilitate intergroup dialogues addressing diverse perspectives, come to consensus on goals, or develop subgroup goals in order to create a functioning inter-agency response. Future studies should explore such dynamics across multiple coalitions nationwide and the impact such perspectives may have on survivors engaging in services.     

Time as a limited resource: Communication strategy in mobile phone networks

We used a large database of 9 billion calls from 20 million mobile users to examine the relationships between aggregated time spent on the phone, personal network size, tie strength and the way in which users distributed their limited time across their network (disparity). Compared to those with smaller networks, those with large networks did not devote proportionally more time to communication and had on average weaker ties (as measured by time spent communicating). Further, there were not substantially different levels of disparity between individuals, in that mobile users tend to distribute their time very unevenly across their network, with a large proportion of calls going to a small number of individuals. Together, these results suggest that there are time constraints which limit tie strength in large personal networks, and that even high levels of mobile communication do not fundamentally alter the disparity of time allocation across networks.     

Comparing Pansexual- and Bisexual-Identified Participants on Demographics,Psychological Well-Being,and Political Ideology in a New Zealand National Sample

Pansexuality, characterized by attraction to people regardless of their gender, is an emerging sexual identity. Research has started to explore the differences between those who identify as pansexual and those who identify as bisexual, typically defined as being attracted to both men and women. This article extends past research by testing for differences between those who identify as pansexual (n = 52) and bisexual (n = 497) in a nationally representative sample. We used the New Zealand Attitudes and Values Study (NZAVS) to test for differences in demographic variables, psychological well-being, and political ideology. We found that pansexual participants were younger, more likely to be gender diverse (transgender or nonbinary), and more likely to be from the indigenous Māori ethnic group than bisexual participants. Pansexual participants also reported higher psychological distress and were more politically liberal than bisexual participants. These results suggest that people who identify as pansexual are, on average, quantifiably different from those who identify as bisexual; this study adds to a new but growing body of research on emerging plurisexual identities.     

Tightening income documentation in a means-tested program: who stays away?

Programs using means tests to identify low-income households face a trade-off between promoting access and ensuring program integrity. The authors use a comparison-district design to estimate the effects of a pilot program to improve the accuracy of the process of certifying students for free or reduced-price meals in the National School Lunch Program. This pilot program required households to provide income documentation with their applications for these benefits. Requiring income documentation did not reduce the proportion of ineligible households getting free or reduced-price meals. Furthermore, this requirement did reduce access to the program among eligible households.     

Risk aversion in expected intertemporal discounted utilities bandit problems

We consider a situation where an individual is facing an uncertain situation, but may costly alter his knowledge of the uncertainties. We study in this context how risk aversion may modify the individual search behavior. We consider a one-armed bandit problem (where one arm is safe and the other is risky) and study how the agent risk aversion can change the sequence of arms selected. The main result is that when the utility function is more concave, the agent has more chances to select the safe arm. We also discuss how search is affected by risk aversion.     

The Effect of Grandparental Support on Mothers’ Labour Market Participation: An Instrumental Variable Approach

Childcare arrangements are key in women’s ability to juggle motherhood and work outside the home. As such, the study of access to childcare and its use is of great policy relevance. We focus on a particular kind of informal childcare, the one provided by grandparents. Empirically, assessing the effect of grandparental childcare is not an easy task due to unobserved preferences. In light of the potential outcome framework, we interpret the biases resulting from unobserved preferences as arising from the non-compliance of mothers to the availability of grandparents and from preferences of grandparents for activities other than childcare. Using an instrumental variable approach on Italian data, we find that the effect of grandparental childcare on mothers’ labour supply is positive, statistically significant and economically relevant. The effect is stronger for less educated mothers, with young children and living in northern and central Italy.