Learning in social networks and contraceptive choice

A puzzling observation in the diffusion of modern fertility control is the persistent diversity in contraceptive practices across communities or social strata. I propose a model of “learning in social networks” to explain this diversity with the random dynamics of word-of-mouth communication. Women are uncertain about the merits of modern contraception and estimate the different qualities of available methods based on imprecise information from network partners. Their contraceptive choices are determined by this estimate and by private knowledge about one s personal characteristics. This process of social learning leads to path-dependent adoption of fertility control within, and diversity in contraceptive practices across villages or social strata.     

Social networks and changes in contraceptive use over time: evidence from a longitudinal study in rural Kenya

The impacts of social networks on changes in contraception in rural Kenya are investigated using special data from a longitudinal household survey. An analytic model, informed by detailed knowledge of the setting, yielded estimates that indicate that (1) social networks have substantial effects even after unobserved factors (e.g., homophily) that may determine social networks are controlled; (2) controlling for these unobserved factors may substantially alter the estimated effects of networks (these controls were not used in previous studies); (3) network effects are important for both men and women; and (4) network effects are nonlinear and asymmetric, suggesting that networks provide information primarily through social learning, rather than by exerting social influence.     

Social networks, perceptions of risk, and changing attitudes towards HIV/AIDS: new evidence from a longitudinal study using fixed-effects analysis

The study presented here is an investigation of the importance of social interactions to perceptions of the risk of AIDS, and explores spousal communication about the AIDS epidemic in rural Malawi. A fixed-effects analysis based on longitudinal data collected in 1998 and 2001 shows that social interactions on the subject of HIV/AIDS have significant and substantial effects on respondents' perceptions of the risk of HIV/AIDS, even after controlling for unobserved factors that affect the selection of social networks. These effects are more complex than previously thought. The dominant mechanisms--social learning and social influence--are found to vary by sex and by region, because of regional variations in the marriage pattern and the resulting implications for the formation of local social networks. The conclusion of the study is that rather than fostering denial and inaction, social interactions are an important vector of change in the face of the HIV/AIDS epidemic.     

Integration within a transgender social network and its effect upon members' social and political activity

The purpose of this study is to examine the male to female transgender social networks and how they influence social and political activity. Four Transgender organizations within Northeast Ohio were contacted for this study. Members were asked to complete a questionnaire and to mail it back. Few of the network elements were useful in predicting social and political activity. Network size has a positive effect upon a person's social and political activity, as did meeting attendance. This study suggests the importance of social networks for Trans-people.     

Effects of Social Networks on Health from a Stress Theoretical Perspective

This paper focuses on the relevance of quantitative and qualitative aspects of social networks in a health context. The study combined a stress theoretical perspective with theories of social support and social capital in order to investigate the mechanisms behind the association of social network size and self-rated health. The main research question in the study is whether social integration affects health by changing stressor appraisal (perceived stressor intensity or anticipated stressor burden). The study used a survey of an Austrian student sample (n = 246) to measure two models of hypothetical exposure to a potentially stressful event. The findings indicate that individuals with larger trust and support networks consider potential stressors to be less threatening, which leads to a reduced level of stress symptoms and a better subjective health condition. The influence of network size on stressor appraisal is fully mediated by the perceived social embeddedness that these ties induce.     

Oppositional identities and the labor market

We develop a model in which nonwhite individuals are defined with respect to their social environment (family, friends, and neighbors) and their attachments to their culture of origin (religion or language), and in which jobs are mainly found through social networks. We find that depending on how strong peer pressures are, nonwhites choose to adopt “oppositional” identities because some individuals may identify with the dominant culture and others may reject that culture, even if it implies adverse labor market outcomes.      

基于整体网络视角的农民工避孕行为影响因素分析

本文采用2005年“深圳市外来农村流动人口调查”数据,利用社会网络分析方法从整体网络角度定量研究了农民工避孕行为的影响因素。利用p*模型从整体网络结构特征分析表明,不同层次的关系结构变量对农民工是否讨论避孕的影响不同,多数个体层次变量对是否讨论避孕有显著影响;本文从整体网络衍生出个体网络,并从衍生个体网络角度研究表明,网络规模和网络成员的避孕措施会对农民工避孕措施多元化有较为显著影响。     

Paternal Incarceration and Adolescent Social Network Disadvantage

Previous research has suggested that adolescent peers influence behavior and provide social support during a critical developmental period, but few studies have addressed the antecedents of adolescent social networks. Research on the collateral consequences of incarceration has explored the implications of parental incarceration for children’s behavioral problems, academic achievement, health, and housing stability, but not their social networks. Using network data from the National Longitudinal Study of Adolescent Health, I find that adolescents with recently incarcerated fathers are in socially marginal positions in their schools and befriend more-marginal peers than other adolescents: their friends are less advantaged, less academically successful, and more delinquent than other adolescents’ friends. Differences in network outcomes are robust to a variety of specifications and are consistent across race and gender subgroups. This study advances the social networks literature by exploring how familial characteristics can shape adolescent social networks and contributes to the collateral consequences of incarceration literature by using network analysis to consider how mass incarceration may promote intergenerational social marginalization.     

The Social Context of Depression Symptomology in Sexual Minority Male Youth: Determinants of Depression in a Sample of Grindr Users

ABSTRACT

The purpose of this study was to understand which social context factors most influence depression symptomology among sexual minority male youth (SMMY). In 2011, 195 SMMY who use Grindr were recruited to complete an online survey in Los Angeles, California. Items focused on social context variables and depression symptomology. Hierarchical multiple regressions were conducted using an ecological framework. The best fitting model accounted for 29.5% of the variance in depression. Experiences of homophobia, gay community connection, presence of an objecting network member, and emotional support were found to be significant predictors. Past experiences of homophobia continuing to affect youth indicates the need for intervention to reduction of homophobia in youths’ social contexts. Interventions that teach youth skills to manage objecting viewpoints or help youth to reorganize their social networks may help to reduce the impact of an objecting network alter.     

The influence of network mortality experience on nonnumeric response concerning expected family size: Evidence from a Nepalese mountain village

This article investigates the effects of sociometric network members' self-reported experiences with infant mortality on nonnumeric responses regarding expected family size among women in a small Nepalese community. The hypotheses tested include (1) that uncertainty about child survival, measured as average infant mortality across social networks, increases the likelihood of a nonnumeric response and (2) that this effect will be stronger when there is less variance in infant mortality experience within women a networks. The results suggest that nonnumeric response may be related to uncertainty about mortality derived through social learning.     

Birth rates decline as neighbors learn from one another how to control fertility

This article refers to a recent article (by Population Council demographer John Bongaarts and University of Pennsylvania sociology professor Susan Cotts Watkins) on strategies for promoting future global fertility decline. The article emphasizes the importance of the process of social interaction as a powerful force that accelerates the pace of demographic transition. The force of social interaction is frequently overlooked. Social interaction operates through personal networks that connect individuals; national channels of interaction connecting social and territorial communities within a country; and global channels connecting countries. Empirical evidence finds that the most important interaction for fertility change occurs in exchanges between personal networks of small communities. When innovative fertility behavior is adopted by a group within a community, then changes are communicated in an ever widening band. It is expected that countries with multiple channels of linked transportation and communication networks and extensive media facilities would experience more rapid fertility decline. Bongaarts and Watkins argue that the extent of a country's links with a global society help determine the timing of its transition to lower fertility. All countries are connected to some extent by ideas, information, or social influence and are at some level of development. When some countries in a region begin their fertility transition, neighboring countries soon follow. Fertility transition occurs even at low levels of development. Fertility decline can occur rapidly, even if socioeconomic development is modest, once the onset of the transition has occurred.     

Social networks and HIV/AIDS risk perceptions

Understanding the determinants of individuals' perceptions of their risk of becoming infected with HIV and their perceptions of acceptable strategies of prevention is an essential step toward curtailing the spread of this disease. We focus in this article on learning and decision-making about AIDS in the context of high uncertainty about the disease and appropriate behavioral responses. We argue that social interactions are important for both. Using longitudinal survey data from rural Kenya and Malawi, we test this hypothesis. We investigate whether social interactions--and especially the extent to which social network partners perceive themselves to be at risk--exert causal influences on respondents' risk perceptions and on one approach to prevention, spousal communication about the threat of AIDS to the couple and their children. The study explicitly allows for the possibility that important characteristics, such as unobserved preferences or community characteristics, determine not only the outcomes of interest but also the size and composition of networks. The most important empirical result is that social networks have significant and substantial effects on risk perceptions and the adoption of new behaviors even after we control for unobserved factors.     

Personal networks and the incomes of men and women in the United States: Do personal networks provide higher returns for men or women?

Despite the many studies focusing on the relationship between social networks and labor market outcomes, few have examined differences in returns to personal networks by gender. Informed by the Social Resources Theory, this study tests whether various types of employment job search networks provide greater returns for males or females. Of the few studies examining gender differences, some find that the benefits of social networks are specific to males; others maintain that they also extend to females, and others argue that the benefits are greater for females than males. There are several limitations of the studies focusing on gender and social networks within the labor market. Such studies have not employed nationally representative datasets. They also neglect important distinctions between various types of personal networks. In this study, these limitations are rectified. A nationally representative dataset, the 2002 General Social Survey, is employed to address how personal networks operate for men and women within the US labor market. Additionally, various types of personal networks are employed to enable a more nuanced approach than previous research. The study provides evidence that social networks provide higher returns to women than men, as women receive returns from their networks while men do not.     

The Persistence of Outmoded Contraceptive Regimes: The Cases of Mexico and Brazil

Two of the most striking characteristics of contraceptive practice in the world today are the wide variation in patterns of use across countries and the tendency of the distribution of use by method to persist or narrow, even as new methods become available. The argument advanced in this article is that the disposition to commit to a reduced range of methods results from positive feedback in the process of contraceptive choice, and follows the logic of path dependence. The positive feedback derives, in large part, from social interaction among both the providers and the users of contraceptive methods. The persistence of outmoded contraceptive regimes is illustrated with the experience of Mexico and Brazil. In each case, it is argued that the conditions, events, and policies in the early stage of the adoption process have had a determinant bearing on the contraceptive practice prevailing in the late 1990s.     

劳动力就业市场化、人力资本与人职匹配

提升人职匹配是提高劳动力市场效率的重要途径，为了研究在我国市场化进程中影响人职匹配的因素其作用是如何变化的，文章通过建构多层次随机系数模型，考察了不同市场化程度下人职匹配的信息传递机制及其变化。研究结果表明：在不完善的市场中，学历及人际网络搜寻方式都可以发送或传递人力资本质量信号，从而提高人职匹配程度；但随着就业市场化程度的增加，作为正式的信号机制，学历的作用保持恒定，而作为补充性的信号传递机制，搜寻方式的作用显著下降。     

西部城市贫困与社会支持网缺失研究—以昆明为例

自20世纪90年代以来,城市贫困日益凸显并成为中国经济社会发展中的突出问题之一,西部地区更是如此。以昆明市为例,通过调查研究发现,社会支持网在西部城市反贫困中发挥着重要作用,但是西部城市贫困家庭社会支持网平均规模仅为2.33,远远小于全国9.1的平均水平。这表明西部城市贫困的产生与社会支持网缺失有着一定的联系。为此,构建完善的社会支持网成为西部地区城市反贫困的政策选择之一。     

Quality of Social Networks Among UK Chinese

The present study examines factors affecting the quality of social networks of Chinese in the UK, in relation to network size and perceived respect gained from social network. The study further explores the role of social networks in relation to the social norms of helping and helping behaviour. Two hundred and eleven British Chinese participants recruited from Chinese health and community centres across the United Kingdom completed a quantitative questionnaire. The 38-item instrument consisted of four main domains: health and functioning; social functioning; volunteerism; and demographics. Findings revealed an association between social participation and social network size. High levels of trust in family members was found to be negatively associated with social network size, implying that strong family relations is a hindrance to social network size among British Chinese participants. More research is needed to further explore social networks of the British Chinese and the implications that this may have on use of services and social participation.     

ENDOGENOUS NETWORKS IN RANDOM POPULATION GAMES

Population learning in dynamic economies traditionally has been studied in contexts where payoff landscapes are smooth. Here, dynamic population games take place over “rugged” landscapes, where agents are uncertain about payoffs from bilateral interactions. Notably, individual payoffs from playing a binary action against everyone else are uniformly distributed over [0, 1]. This random population game leads the population to adapt over time, with agents updating both actions and partners. Agents evaluate payoffs associated to networks thanks to simple statistics of the distributions of payoffs associated to all combinations of actions performed by agents out of the interaction set. Simulations show that: (1) allowing for endogenous networks implies higher average payoff compared to static networks; (2) the statistics used to evaluate payoffs affect convergence to steady-state; and (3) for statistics MIN or MAX, the likelihood of efficient population learning strongly depends on whether agents are change-averse or not in discriminating between options delivering the same expected payoff.     

社会排斥视野下的农村青年婚配难解读——来自辽东南东村光棍现象的调查与思考

农村青年婚配难是各种结构性因素与非结构性（场景性）因素共同作用的结果;出生性别比失衡、婚姻梯次和年龄结构差等是导致农村青年婚配难的结构性因素,而个人条件、经济基础、思想观念和社会关系网络等则是引致农村青年婚配难的非结构性（场景性）因素。本文基于辽东南东村光棍现象的实地调查,通过引入社会排斥理论,对农村青年婚配难现象的非结构性因素展开了分析和探讨,认为：身体排斥、身份排斥、经济排斥、观念排斥和社会关系排斥等是导致农村青年婚配难的主要排斥机制。婚姻排斥作为一个集场景性与结构性相结合的分析性框架,是我们理解和解释婚配难、婚姻市场失衡等问题的新的理论视角。农村青年要想顺利地进入婚姻市场,青年自身、基层组织和国家必须“力所能及”地克服和消除社会排斥机制。     

Social Network Methodology in the Study of Disasters: Issues and Insights Prompted by Post-Katrina Research

Dynamic social networks, a key concept in modern social science research, are beginning to play a major role in understanding the ways in which individuals and communities respond to disasters. The authors of this paper review the relevant theory and research regarding how crises cause change in social networks, and how those changes may or may not facilitate recovery, as a function of the kinds of changes that occur. It applies the In/Out/Seeker/Provider (IOSP) framework to identify categories in which we might study disasters and the impact both on the networks and the impacts to the networks. This paper details options for applying social network analysis to research of both pre- and post-disaster settings and concludes by framing a research agenda for the future study of the dynamics of network change following a disaster.