HIV seroprevalence and risk behaviors among clients attending a clinic for the homeless in Miami/Dade County,Florida, 1990–1996

In the early 1990s, HIV seroprevalence was highest at the Miami homeless clinic among 16 homeless sites participating in a nationwide sentinel survey. To examine dynamic seroprevalence patterns in Miami's homeless clients in relation to demographics and risk behaviors over six years, we analyzed data from an unlinked (blinded) serosurvey of clients attending the principal primary care clinic serving Miami's homeless. Data were from 3,797 medical encounters with homeless persons who, on their initial clinic visit within an annual survey period, received routine serologic testing and a risk behavior survey. Overall HIV seroprevalence was 15.9% and infection rates for men (16.4%) and women (14.5%) did not differ. Seroprevalence for blacks (19.9%) was significantly higher than for Hispanics (9.1%) or whites (8.3%) (p < 0.0001). Seroprevalence was 12.6% (35 times the national rate) for clients reporting heterosexual contact as their only risk. Significant increases in seroprevalence, above this heterosexual-contact-only 'baseline', were found for clients disclosing high-risk behaviors: male-to-male sex, drug injection, receiving or giving money/drugs for sex, and sexual contact with a drug injector or HIV-infected partner (p < 0.0001). Seroprevalence declined over six years from 23.2 to 7.2% (p < 0.0001). Significant downward trends were observed for men and women, blacks and Hispanics, men who have sex with men, and clients reporting heterosexual contact. The proportion of clients reporting high-risk behaviors decreased sharply (p < 0.0001). Elevated HIV seroprevalence in Miami's homeless clients was strongly associated with high-risk behaviors. Expansion of HIV prevention and HIV/drug treatment services for homeless persons is strongly recommended.     

Immigrants as brokers: dialogical diffusion from Spanish indignados to Occupy Wall Street

This article analyses the role played by Spanish immigrants in the diffusion of the indignados movement in Occupy Wall Street (OWS). I argue that Spanish residents in New York City acted as brokers between the two movements, and that their behaviour had a significant impact on OWS’s understanding of itself as an expansive, inclusive and empathic phenomenon. Building on recent theoretical developments, which stress the importance of dialogue and collective learning in the transnational diffusion of historical social movements, this research produces results at different levels. At the empirical level, the problems faced by the immigrants reveal the cultural complexity of transnational diffusion within the recent wave of contention. At the analytical level, the personal contact and intergroup dialogue established between immigrants and local activists challenge accounts stressing the role of social media and the internet within the transnational diffusion of this protest. At the theoretical level, the article develops a process-oriented perspective on brokerage, improving our understanding of its implications concerning diffusion. I argue that a longitudinal analysis of brokerage shows how interaction can modify role identity and movement diffusion: diffusion develops where brokers maintain a coordinating role in the movement, and ceases to do so where brokers are displaced from this central position.     

Household demographic change and land use/land cover change in the Brazilian Amazon

Demographic interest in population and environment has grown in recent decades. One of the most prominent research areas in this tradition addresses the impact of population on land use and land cover change. Building on this tradition, we examine the effects of household demographic composition on land use and land cover on small farms in two study areas in the Brazilian Amazon. Fixed effects regression models of used area and forested area show few consistent effects of changes in household demography on land use and land cover change. Effects are inconsistent with the household life cycle model that currently dominates the literature on household demographic effects in frontiers. Changes in the number of children and women, particularly young women, have the most significant effects on land use and land cover change. We conclude by arguing that households strategically access cash for investment in agriculture and that specific strategies are determined by economic and institutional context.

A vulnerability approach to the definition of the middle class

Measurement of the middle class has recently come to the center of policy debate in middle-income countries as they search for the potential engines of growth and good governance. This debate assumes, first, that there is a meaningful definition of class, and second, that the thresholds which define relatively homogeneous groups in terms of pre-determined sociological characteristics can be found empirically. This paper aims at proposing a view of the middle class based on vulnerability to poverty. Following this approach the paper exploits panel data to determine the amount of comparable income -associated with a low probability of falling into poverty— which could define the lower bound of the middle class. It looks at absolute thresholds, challenging the view that people just above the poverty line are actually part of the middle class. In an analogy with poverty measurement, there is a degree of arbitrariness in the definition of specific thresholds, but the concept behind them is clear and economically meaningful. The estimated lower-threshold is used in cross-section surveys to quantify the size and the evolution of middle classes in Chile, Mexico, and Peru over the past two decades. The evidence also shows that the middle class has increased significantly in all three countries. There is an important group of people, however, who cannot be defined as middle class from this perspective, but remain vulnerable to fall back into poverty.     

How social networks affect policy implementation: An analysis of street-level bureaucrats' performance regarding a health policy

Policy implementation is an interactive process between citizens and street-level bureaucrats. Although the literature has already addressed different factors that influence discretion, there is still a gap in understanding if and how bureaucrats' relational profiles affect policy implementation. This article analyses bureaucrats' interactions and the relational environments in which they exercise their discretion. The hypothesis is that bureaucrats' different relational profiles specify policy implementation at the street level. We study bureaucrats in a Brazilian health care programme involving community workers that requires regular visits to beneficiary families' homes. The research departs from ethnography and network analyses with workers from three very different contexts. We analyse bureaucrats' practices, the discursive styles mobilized in their interactions, and their personal networks. The results show that organizational factors are central to explain variations in practices, and their relational profiles highly influence the discursive styles used by bureaucrats in their interactions with citizens. The article concludes that relational elements can affect the exercise of discretion and influence interactions at the street level and should be incorporated more systematically in the implementation literature.     

Bayesian analysis of the generalized gamma distribution using non-informative priors

The Generalized gamma (GG) distribution plays an important role in statistical analysis. For this distribution, we derive non-informative priors using formal rules, such as Jeffreys prior, maximal data information prior and reference priors. We have shown that these most popular formal rules with natural ordering of parameters, lead to priors with improper posteriors. This problem is overcome by considering a prior averaging approach discussed in Berger et al. [Overall objective priors. Bayesian Analysis. 2015;10(1):189–221]. The obtained hybrid Jeffreys-reference prior is invariant under one-to-one transformations and yields a proper posterior distribution. We obtained good frequentist properties of the proposed prior using a detailed simulation study. Finally, an analysis of the maximum annual discharge of the river Rhine at Lobith is presented.     

‘The sweet memories of home have gone’: displaced people searching for home in a liminal space

By ignoring how conflict and displacement disrupt the location of home for those who flee within national borders, studies on displacement have largely failed to fully understand the material and symbolic impacts of living without a place called home. Drawing on the experiences of internally displaced people in Colombia, this paper argues that following conflict and displacement home becomes neither an entirely fixed place those who escape conflict unequivocally want to return nor an entirely mobile space they necessarily experience on the move. Rather than ambiguously attached to the place left behind or refashioned on the move, the empirical findings reveal that home is consistently experienced by the displaced as a tension between ‘here’ and ‘there’ or ‘nowhere’. Although many displaced people do find a physical place to live following displacement they experience the sense of being trapped in a liminal space where they feel emotionally and existentially homeless. Analysis of detailed interviews shows that most of them continue to search for a sense, rather than a place called, home. A home which is emotional and affective rather than purely physical. The paper concludes by highlighting how sedentarist and non-sedentarist understandings of home coexist in the displaced location of home.     

Testing parametric models in linear‐directional regression

This paper presents a goodness‐of‐fit test for parametric regression models with scalar response and directional predictor, that is, a vector on a sphere of arbitrary dimension. The testing procedure is based on the weighted squared distance between a smooth and a parametric regression estimator, where the smooth regression estimator is obtained by a projected local approach. Asymptotic behaviour of the test statistic under the null hypothesis and local alternatives is provided, jointly with a consistent bootstrap algorithm for application in practice. A simulation study illustrates the performance of the test in finite samples. The procedure is applied to test a linear model in text mining.     

Emulation and state-by-state variations in bankruptcy rates

This paper explores differences in personal bankruptcy rates across the American states. Particular emphasis is given to the Veblenian idea of emulative consumption where a desire to “keep up with the Jones”’ results in over-borrowing leading eventually to bankruptcy. The paper posits an empirical model that incorporates a set of standard variables mentioned in the literature and variables specifically related to emulation, income level, income distribution and urbanization. Using state level pooled data for the period 2000–2009 the paper finds that the more unequal the distribution of income in a state and the more urban the state, the greater the bankruptcy rate in the state. These basic findings point to emulative consumption behavior as an important factor in explaining differences in personal bankruptcies across the states.