Detecting Spillover Effects: Design and Analysis of Multilevel Experiments

Interpersonal communication presents a methodological challenge and a research opportunity for researchers involved in field experiments. The challenge is that communication among subjects blurs the line between treatment and control conditions. When treatment effects are transmitted from subject to subject, the stable unit treatment value assumption (SUTVA) is violated, and comparison of treatment and control outcomes may provide a biased assessment of the treatment’s causal influence. Social scientists are increasingly interested in the substantive phenomena that lead to SUTVA violations, such as communication in advance of an election. Experimental designs that gauge SUTVA violations provide useful insights into the extent and influence of interpersonal communication. This article illustrates the value of one such design, a multilevel experiment in which treatments are randomly assigned to individuals and varying proportions of their neighbors. After describing the theoretical and statistical underpinnings of this design, we apply it to a large‐scale voter‐mobilization experiment conducted in Chicago during a special election in 2009 using social‐pressure mailings that highlight individual electoral participation. We find some evidence of within‐household spillovers but no evidence of spillovers across households. We conclude by discussing how multilevel designs might be employed in other substantive domains, such as the study of deterrence and policy diffusion.     

Why we should eliminate personal belief exemptions to vaccine mandates

We argue that personal belief exemptions to the mandate for childhood immunizations should not be allowed. Parents who choose not to immunize their children put both their own children and other children at risk. Other children are at risk because unimmunized children go to school or day care when they are contagious but asymptomatic, exposing many more children to potentially dangerous infections. The risks to children from disease are much higher than the risks of vaccines. There are, of course, some bona fide reasons why children should not be immunized. Some children have known allergies or other medical contraindications to certain immunizations. Immunization refusals based on parental beliefs, however, do not fall into this category. In those cases, children are denied the protection of immunizations without any medical or scientific justification. By eliminating personal belief exemptions to those childhood vaccines associated with contagious diseases that have high rates of childhood mortality, we would better protect children and would more fairly spread the burdens of this important public health program.     

‘I'm going to get a job at the factory’: attitudes to women's employment in a mining community, 1945-65

This article examines how couples in mining households managed the increasing opportunities for women to work outside of the home in the period following the Second World War. Households in mining communities have regularly been characterised in research literature as operating strictly segregated gender roles and the lack of employment opportunities in mining areas appears to have accentuated the rigid division of labour. However, in some areas where the mining industry was in decline, new employment opportunities for married women increased, which inevitably placed a strain on the male provider model. This article explores these issues in relation to the ironstone mining district of East Cleveland and uses data generated from thirty-three semi-structured interviews. It will be argued that whilst the separation of the male provider and female homemaker role remained the ideal for many couples, others chose to avail themselves of the economic and psychological benefits of female employment. However, even amongst those couples where the women did undertake paid employment, the image of the male as provider was still preserved by the use of various strategies.     

new millennium’s feminine subject of feminism

This paper explores the changing feminine subject of feminism by investigating women’s sexual daydreams. Described by Rosi Braidotti following Luce Irigaray as the ‘virtual feminine’, and by Teresa de Lauretis as the ‘space-off’, the feminist subject is a mutating configuration embodying that which is not colonised from phallogocentric representations. Following Frigga Haug’s work on daydreams, the paper is informed by a study that draws on responses from nineteen women in a university setting to an anonymous online survey that asked them to write a daydream about how they would like to express their sexualities in an ideal world. The data reveal that these women of the new millennium imagine spaces of gender/sexual equity, characterised by a spirit of sexual adventure and ethical and emotionally intimate sex. I argue that these sexual imaginings are more progressive than earlier ones, filling in some of the details omitted from contemporary hegemonic representations of feminine sexuality. Arguably providing a snapshot of the feminist subject in its ongoing historical metamorphosis, the paper considers the meaning of these transformations.     

Systemic Self-Regulation: A Framework for Trauma-Informed Services in Residential Juvenile Justice Programs

Most youth detained in juvenile justice facilities have extensive histories of exposure to psychological trauma. Traumatic stress plays a key role in their mental health and behavioral problems and needs, and in their safety and rehabilitation and the security and effectiveness of detention facilities. We provide an overview of the barriers to successful provision of mental health services for youths in juvenile justice facilities, including those involving youth, parents, and juvenile justice residential facility staff and administrators. Next, we discuss the relevance and potential utility of approaching mental health needs using posttraumatic stress disorder (PTSD), and more broadly posttraumatic dysregulation, as an organizing framework. Examples of how a posttraumatic dysregulation perspective can enhance juvenile justice residential facility milieus and services are presented, with an overview of traumatic stress intervention models that have shown promise, or potentially could be deployed, in developing and sustaining trauma-informed juvenile justice facilities.     

Forensic Identification of Seal Oils Using Lipid Profiles and Statistical Models

Seal blubber oils are used as a source of omega‐3 polyunsaturated fatty acids in Canada but prohibited in the United States and (FA) European Union. Thus, a reliable method is needed to identify oils originating from seals versus fish. Two lipid profiling methods, fatty acid analysis using gas chromatography and triacylglycerol (TAG) analysis using liquid chromatography and mass spectrometry, were applied with statistical models to discriminate commercial oils and blubber samples harvested from marine fish and seals. Significant differences were observed among FA profiles, and seal samples differed from each of the fish oils (p ≤ 0.001). FA and TAG profiles were used to discriminate sample groups using a random forest classifier; all samples were classified correctly as seals versus fish using both methods. We propose a two‐step method for the accurate identification of seal oils, with preliminary identification based on FA profile analysis and confirmation with TAG profiles.