Marijuana use and depression

The primary goal of this study is to examine the association between marijuana use and adult depressive symptomatology. The key independent variables examined are age of marijuana initiation, frequency of current marijuana use, the use of other licit and illicit drugs, and whether marijuana was used to cope with problems. The relationships among these variables are assessed using data from the Young Men and Drugs Survey (n = 1,941), a nationally representative sample of men from the 1944-1954 birth cohort. Results show that early marijuana initiation appears to be weakly associated with increased depression in adulthood. This effect, however, is mediated by educational attainment, employment status, marital status, and other drug use, notably alcohol and tobacco use. Adult frequency of marijuana use is not significantly associated with increased depression in adulthood. Finally, marijuana users who use the drug to cope with problems are more depressed than those who do not use to cope with problems.     

‘We Can All Just Get on a Bus and Go’: Rethinking Independent Mobility in the Context of the Universal Provision of Free Bus Travel to Young Londoners

This paper uses qualitative data from interviews with 118 young Londoners (age 12–18) to examine how the universal provision of free bus travel has affected young people’s independent mobility. Drawing on Sen’s capabilities approach, we argue that free bus travel enhanced young Londoners’ capabilities to shape their daily mobility, both directly by increasing financial access and indirectly by facilitating the acquisition of the necessary skills, travelling companions and confidence. These capabilities in turn extended both opportunity freedoms (e.g. facilitating non-‘necessary’ recreational and social trips) and process freedoms (e.g. feeling more independent by decreasing reliance on parents). Moreover, the universal nature of the entitlement rendered buses a socially inclusive way for groups to travel and spend time together, thereby enhancing group-level capabilities. We believe this attention to individual and group capabilities for self-determination provides the basis for a broader and more child-centred view of independent mobility than the typical research focus upon travelling without an adult and acquiring parental permissions.     

Ordinal independence in nonlinear utility theory

Individual behavior under uncertainty is characterized using a new axiom, ordinal independence, which is a weakened form of the von Neumann-Morgenstern independence axiom It states that if two distributions share a tail in common, then this tail can be modified without altering the individual's preference between these distributions. Preference is determined by the tail on which the distributions differ. This axiom implies an appealing and simple functional form for a numerical representation of preferences. It generalizes the form of anticipated utility, and it explains some well-known forms of behavior, such as the Friedman-Savage paradox, that anticipated utility cannot.     

Standard Errors for Elasticities: A Comparison of Bootstrap and Asymptotic Standard Errors

This article compares two methods of deriving standard errors for elasticities in a linear expenditure demand system with first-order autoregressive errors. The first is the ordinary Taylor series method and the second is Efron's bootstrap. In an example problem, these two methods yielded similar values for the standard errors, with the exception of the income elasticity standard errors, for which the asymptotic standard errors were apparently too large by a factor of two.     

STRANGE YET STYLISH HEADGEAR VR consumption and the construction of gender

This article examines how gender is inscribed and reproduced in the consumption of Virtual Reality (VR) technologies. The focus is on how virtual reality systems become embedded in 'everyday life' through leisure and consumption, and how the spectacles and disciplines associated with consumption sites produce gendered virtual subjects. Studies of new communications technologies have tended to polarize between 'cyberpunk'/'cyberfeminist' visions of bodily transcendence in 'cyberspaces', and the critique of such visions from social theorists who focus on the reproduction of social and cultural inequalities through technical systems. These approaches tend to neglect the specific sites in which the social relations of VR are played out. A 'multi-sited' ethnographic study of immersive virtual reality systems is the basis for discussion of how virtual reality technologies produce gender in specific sites. Virtual systems are positioned and used differently in various locales such as arcades and art galleries, bars and theme parks and cafes. The article discusses the practices of consumption which (re)produce and maintain conventional bodily and subjective boundaries. What relationships are becoming institutionalized? Are new conventions of gender created in these consumption relationships? The construction of spectacle and space, and the specific bodily disciplines required for participation in virtual realities in locations of consumption is particularly important in the formation of gender dynamics. Multiple subject positions are offered through competing technical, economic and cultural practices in diverse sites. These positions can establish new conventions of virtual identities and experiences, but also remain shot through with familiar operational categories of gendered identities and bodily practices. This article argues that immersive virtual reality technologies cannot be understood without some consideration of the locales in which they are embedded, and the social identities they make possible or constrain. A local, reflexive and feminist orientation assists in understanding the gendered dynamics associated with 'becoming virtual'.