A new family of random graphs for testing spatial segregation

The authors discuss a graph‐based approach for testing spatial point patterns. This approach falls under the category of data‐random graphs, which have been introduced and used for statistical pattern recognition in recent years. The authors address specifically the problem of testing complete spatial randomness against spatial patterns of segregation or association between two or more classes of points on the plane. To this end, they use a particular type of parameterized random digraph called a proximity catch digraph (PCD) which is based on relative positions of the data points from various classes. The statistic employed is the relative density of the PCD, which is a U‐statistic when scaled properly. The authors derive the limiting distribution of the relative density, using the standard asymptotic theory of U‐statistics. They evaluate the finite‐sample performance of their test statistic by Monte Carlo simulations and assess its asymptotic performance via Pitman's asymptotic efficiency, thereby yielding the optimal parameters for testing. They further stress that their methodology remains valid for data in higher dimensions.     

Children's and Adolescents' Developing Perceptions of Gender Inequality

Two studies examined children's and adolescents' developing perceptions of gender inequality. The first study examined perceptions of inequality among 272 early, middle, and late adolescents, focusing on the spheres of politics, business, and the home. Results indicated an age‐related increase in perceptions of male dominance. Men were seen to have more power and status in politics than in business whereas relative equality was seen to exist in the home. The second study included 96 child and adolescent participants aged 7–15 and once again found an increase in general perceptions of male dominance with age. Results suggest that young children are less explicitly aware of gender inequality than might be assumed given their extensive knowledge of power‐loaded gender‐role stereotypes.     

What demographers can learn from fruit fly actuarial models and biology

Historically demographers have viewed the results of actuarial studies of nonhuman species, particularly those on invertebrates such as fruit flies, as largely irrelevant to investigations on human populations. In this paper I present life table data from large scale studies on the Mediterranean fruit fly, and show that they provide important insights into fundamental aspects of mortality relevant to human populations: the trajectory of mortality at older ages, sex mortality differentials, the concept of maximal life span, and demographic heterogeneity and selection. An overriding theme of the paper is the need for demographers to acquire a heightened awareness of new developments in biology including areas such as evolutionary ecology, experimental demography, and molecular medicine.     

A social semiotic analysis of male heterosexuality in sexual health resources: the case of images

This paper describes the application of the visual social semiotics schema developed by Kress and van Leeuwen (1996) to sexual health leaflets and posters for young people (age 13 to 19 years) in order to explore how male heterosexuality is managed at a visual level. It illustrates the use of the method, and its advantages and drawbacks in comparison with other methods, and highlights the importance of visual representations as a source of sociological data. This analysis shows how social semiotics can be applied to reveal the discourses in images, and how sexual health materials reinforce dominant ideologies of masculinity. The implications of the findings are discussed in relation to the potential effectiveness of sexual health materials.     

Dementia Caregiving in the Context of Late‐Life Remarriage: Support Networks,Relationship Quality,and Well‐being

Caregiving research has not accounted for increasingly diverse and complex marital and family histories of older Americans. The authors examined social relations and care‐specific positive and negative support networks among late‐life remarried wife dementia caregivers (N = 61) to determine associations among network structure, relationship quality with and support received from network members, and global assessments of family and stepfamily disagreement on caregiver well‐being. Own family and friends predominated in the social relations and positive networks. Although over half (54%) of respondents included a stepfamily member in their positive networks, stepchildren comprised the largest group (35%) in the negative networks. Larger negative networks and actively negative interactions were related to greater caregiver burden, and more global disagreement with stepfamily was associated with greater depression and burden. The findings illustrate the complex nature of support and the value of targeted examinations of caregiving support dynamics among late‐life remarried older adults and stepfamilies facing health demands.     

The Association Between Sexual Behavior and Affect: Moderating Factors in Young Women

Sexual behavior is associated with increased positive affect and decreased negative affect. However, contextual variables such as partner type, behavior type, and condom use may moderate these associations. The goal of the present research was to examine these contextual moderators using monthly longitudinal data from a sample of young women. Female first-year college students (N = 477) completed monthly assessments of their sexual behaviors and positive and negative affect. Participants reported more negative affect in months in which they engaged in sexual behavior compared to months in which they did not. This association was moderated by partner type, such that only sexual behavior with casual partners was associated with increased negative affect. Participants reported more positive affect during months with kissing/touching only compared to months without sexual behavior; however, this association did not differ significantly from the association between oral/vaginal sex and positive affect. Condom use did not moderate the association between vaginal sex and positive or negative affect. In this sample of young women transitioning to college, engaging in sexual behavior was generally associated with negative affect; however, changes in affect depended on partner type and sexual behaviors. Findings have implications for sexual health education.     

Understanding Fraternity Drinking: Five Recurring Themes in the Literature, 1980–1998

Abstract

In light of widespread concern about alcohol abuse on college campuses, the authors review the empirical literature concerning fraternity drinking published since 1980. The review is structured according to 5 themes that emerge from the literature: (a) the continuity between high school and college drinking, (b) the self-selection of heavy drinkers into environments that support heavy drinking, (c) the central role of alcohol in fraternity socialization, (d) the misperception of drinking norms, and (e) the enabling environment of the fraternity house. The literature is summarized for the benefit of those who wish to better understand the role of alcohol use in the fraternity system.