Comparisons among heterosexual, bisexual, and homosexual male sadomasochists

Between 1982 and 1984 a questionnaire designed to elicit demographic and behavioral information concerning individuals who participate in sadomasochism (S&M) was distributed nationally. Data from 136 heterosexual, 45 bisexual, and 91 homosexual male sadomasochists (N = 272) were analyzed. Similarities and differences among these three groups in response to 15 of the 40 questions asked concerning age and manner of first S&M interest, openness with others concerning those interests, self image and adjustment, sexual behavior, and sex role orientation are reported and compared to findings previously reported by Spengler (1977), Lee (1979), Kamel (1980), Weinberg & Falk (1980) and Weinberg, Williams, & Moser (1984). Issues concerning the categorization of the respondents into appropriate S&M sex role types are also discussed.     

Graphs for Margins of Bayesian Networks

Directed acyclic graph (DAG) models—also called Bayesian networks—are widely used in probabilistic reasoning, machine learning and causal inference. If latent variables are present, then the set of possible marginal distributions over the remaining (observed) variables is generally not represented by any DAG. Larger classes of mixed graphical models have been introduced to overcome this; however, as we show, these classes are not sufficiently rich to capture all the marginal models that can arise. We introduce a new class of hyper‐graphs, called mDAGs, and a latent projection operation to obtain an mDAG from the margin of a DAG. We show that each distinct marginal of a DAG model is represented by at least one mDAG and provide graphical results towards characterizing equivalence of these models. Finally, we show that mDAGs correctly capture the marginal structure of causally interpreted DAGs under interventions on the observed variables.     

Predicting tree species richness in urban forests

There has been an increasing interest in urban forests and the levels of biodiversity they contain. Currently there are no spatially explicit maps of tree species richness in urban areas. This research tests and identifies GIS and remote sensing metrics (climate, area, productivity, three-dimensional structure) hypothesized to be associated with species richness in native forests and identifies methods that can be applied to predict and map tree species richness in cities. We quantified tree species richness, floristic composition, and structure in 28 1-ha plots in the city of Los Angeles. Climate and remote sensing metrics from high-resolution aerial imagery (10 cm), QuickBird (60 cm), Landsat (30 m), MODIS (250 m), and airborne lidar (2 m) were collected for each plot. There were 1208 individual stems and 108 trees identified to species. Species richness ranged from 2 to 31 species per ha and averaged 17 species per ha. Tree canopy cover from QuickBird explained the highest portion of variance (54%) in tree species richness followed by NDVI from Landsat (42%). Tree species richness can be higher in residential urban forests than native forests in the United States. Spatially explicit species richness maps at 1 ha can be created and tested for cities in order to identify both hotspots and coldspots of tree species richness and changes in species richness over time.     

A Systematic Review of Sexual Dysfunction Measures for Gay Men: How Do Current Measures Measure Up?

The measurement of subjective components of sexual functioning is of increasing importance in clinical research and practice. Differences have been reported in prevalence rates and experiences of sexual difficulties between heterosexual and gay men. The aim of this article is to identify reliable and valid measures of sexual dysfunction suitable for use with gay men. Seven measures were reviewed; details about item development, dimensionality, reliability, and validity are provided. Heteronormative and heterosexist wording were evident throughout. Several areas of concern emerged in relation to psychometric properties (e.g., questionable validity). No psychometrically robust sexual function measure was identified for use with gay populations.     

Globalisation and Female Economic Participation in Sub-Saharan Africa

This study assesses the relationship between globalisation and the economic participation of women (EPW) in 47 Sub-Saharan African countries for the period 1990–2013. EPW is measured with the female labour force participation and employment rates. The empirical evidence is based on panel-corrected standard errors and fixed effects regressions. The findings show that the positive effect of the overall globalisation index on EPW is dampened by its political component and driven by its economic and social components, with a higher positive magnitude from the former or economic globalisation. For the most part, the findings are robust to the control for several structural and institutional characteristics. An extended analysis by unbundling globalisation shows that the positive incidence of social globalisation is driven by information flow (compared to personal contact and cultural proximity) while the positive effect of economic globalisation is driven by actual flows (relative to restrictions). Policy implications are discussed with some emphasis on how to elevate women’s social status and potentially reduce their victimisation to male dominance.