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Results for “social network analysis”

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PubMed2004

Identifying the role that animals play in their social networks.

Techniques recently developed for the analysis of human social networks are applied to the social network of bottlenose dolphins living in Doubtful Sound, New Zealand. We identify communities and subcommunities within the dolphin population and present evidence that sex- and age-related homophily play a role in the formation of clusters of preferred companionship. We also identify brokers who act as links between sub-communities and who appear to be crucial to the social cohesion of the population as a whole. The network is found to be similar to human social networks in some respects but different in some others, such as the level of assortative mixing by degree within the population. This difference elucidates some of the means by which the network forms and evolves.

Age Factors↗

PubMed2006

Structure of peer-to-peer social networks.

This paper presents a statistical analysis of the structure of peer-to-peer (P2P) social networks that captures social associations of distributed peers in resource sharing. Peer social networks appear to be mainly composed of pure resource providers that guarantee high resource availability and reliability of P2P systems. The major peers that both provide and request resources are only a small fraction. The connectivity between peers, including undirected, directed (out and in) and weighted connections, is scale-free and the social networks of all peers and major peers are small world networks. The analysis also confirms that peer social networks show in general disassortative correlations, except that active providers are connected between each other and by active requesters. The study presented in this paper gives a better understanding of peer relationships in resource sharing, which may help a better design of future P2P networks and open the path to the study of transport processes on top of real P2P topologies.

Journal Article↗

PubMed2006

Empirical analysis of an evolving social network.

Social networks evolve over time, driven by the shared activities and affiliations of their members, by similarity of individuals' attributes, and by the closure of short network cycles. We analyzed a dynamic social network comprising 43,553 students, faculty, and staff at a large university, in which interactions between individuals are inferred from time-stamped e-mail headers recorded over one academic year and are matched with affiliations and attributes. We found that network evolution is dominated by a combination of effects arising from network topology itself and the organizational structure in which the network is embedded. In the absence of global perturbations, average network properties appear to approach an equilibrium state, whereas individual properties are unstable.

Electronic Mail↗

PubMed1989

Schizophrenia and social network patterns: a survey of black inner-city outpatients.

An analysis of the social networks of black schizophrenic outpatients living in the inner-city (n = 47) revealed network patterns similar to those found in schizophrenics in other populations, thereby suggesting such patterns may be found cross-culturally. Because of the diminution in network size found among old black schizophrenics, there was a potential for older schizophrenics to overload their remaining linkages, particularly kin. However, with increased age, there was less material dependence on and greater satisfaction with network members. These findings are discussed with respect to the lower readmission rates found among the aging schizophrenics.

Adolescent↗

PubMed2003

[Social network and social support in patients with chronic inflammatory bowel disease].

OBJECTIVES: The aim of the present study was to make a precise analysis of social network and social support to patients with chronic inflammatory bowel diseases (CEDE) in comparison with healthy controls. METHODS: 35 patients with colitis ulcerosa and 47 patients with Morbus Crohn were interviewed using the questionnaire for investigating social network and social support (SONET). Medical data on disease activity were also assessed. CEDE patients were compared with healthy controls, and patients with active disease were compared with those whose disease was in remission. RESULTS: In comparison to healthy controls, the patients demonstrated a significantly smaller network, comprising fewer extra-familial persons but more relationships to the closest core family members. CEDE patients also reported a significantly smaller number of persons from whom they received social support. Patients with active disease were generally more unsatisfied with the support received than those whose disease was in remission. CONCLUSIONS: Our study shows that the closest family members are usually responsible for the patient's social support. Further investigation is necessary to assess the needs of the core family in this stressful situation.

Adaptation, Psychological↗

PubMed2000

Use of adult day services and home health care services by older adults: a comparative analysis.

This study compares adult day services (ADS) and home health care (HHC) users on the indicators of personal characteristics, physical health, mental health and social network contacts. Analysis includes all 62 reported ADS users and a random sample of 91 HHC users from the Longitudinal Study of Aging. Results indicate that ADS users are younger, have greater cognitive impairment, need more supervisory assistance with activities of daily living (ADLs), and have more social contacts than HHC users. The findings also underscore the importance of emphasizing the functional and cognitive limitations in differentiating home- and community-based services. Instead of exclusively focusing on physical needs, authors suggest strategies that ensure integrated care models to address physical, mental and social needs of elders in both settings.

Activities of Daily Living↗

PubMedDate not supplied

Size and complexity of social networks among substance abusers: childhood and current correlates.

The objective of this study was to identify parental, childhood, demographic, and social function factors associated with social network size and complexity among substance abusers using retrospective data regarding family and childhood history and current data regarding demographic characteristics and psychosocial function. The authors interviewed 505 voluntary patients with substance abuse at two university medical centers in Minnesota and Oklahoma with alcohol-drug programs located within departments of psychiatry. Data collection instruments included a childhood questionnaire, a demographic checklist, and two psychiatric rating scales of psychosocial function. The authors found that years of education, current residence with others, being actively occupied at work or school, and higher psychosocial function on two psychiatrist-rated scales were associated with increased social network size and complexity. Loss of mother, out-of-home placement, and runaway before age 18 were associated with smaller social networks in adulthood. Age, gender, and current marital status were not associated with social network. Regression analysis indicated that network size (i.e., the number of individuals in the network) was associated with higher psychosocial function over the last year but not over the last two weeks, whereas network complexity (ie, the number of subgroups in the network) was related to psychosocial function over both the last year and the last two weeks. These data indicate that in addicted persons, both childhood factors and current social factors affect network size and complexity. Network complexity may be amenable to short-term change, whereas network size may be more related to longer-term coping.

Adaptation, Psychological↗

PubMed2005

Rationale, design and conduct of a comprehensive evaluation of a school-based peer-led anti-smoking intervention in the UK: the ASSIST cluster randomised trial [ISRCTN55572965].

BACKGROUND: To date, no school-based intervention has been proven to be effective in preventing adolescent smoking, despite continuing concern about smoking levels amongst young people in the United Kingdom. Although formal teacher-led smoking prevention interventions are considered unlikely to be effective, peer-led approaches to reducing smoking have been proposed as potentially valuable. METHODS/DESIGN: ASSIST (A Stop Smoking in Schools Trial) is a comprehensive, large-scale evaluation to rigorously test whether peer supporters in Year 8 (age 11-12) can be recruited and trained to effect a reduction in smoking uptake among their fellow students. The evaluation is employing a cluster randomised controlled trial (RCT) design with secondary school as the unit of randomisation, and is being undertaken in 59 schools in South East Wales and the West of England. Embedded within the trial are an economic evaluation of the intervention costs, a process evaluation to provide detailed information on how the intervention was delivered and received, and an analysis of social networks to consider whether such a peer group intervention could work amongst schoolchildren in this age group. Schools were randomised to either continue with normal smoking education (n = 29 schools, 5562 students), or to do so and additionally receive the ASSIST intervention (n = 30 schools, 5481 students). No schools withdrew once the trial had started, and the intervention was successfully implemented in all 30 schools, with excellent participation rates from the peer supporters. The primary outcome is regular (weekly) smoking, validated by salivary cotinine, and this outcome has been obtained for 94.4%, 91.0% and 95.6% of eligible students at baseline, immediate post-intervention, and one-year follow-up respectively. DISCUSSION: Comprehensive evaluations of complex public health interventions of this scale and nature are rare in the United Kingdom. This paper demonstrates the feasibility of conducting cluster RCTs of complex public health interventions in schools, and how the rigour of such designs can be maximised both by thorough implementation of the protocol and by broadening the scope of questions addressed in the trial by including additional evaluative components.

Adolescent↗

PubMed2006

Agent based simulations in healthcare.

Agent Based Simulations (ABS) is a relatively recent computer paradigm. As opposed to "top down" conventional computer simulations, the ABS approach is a "bottom-up" modelling technique where a medium to high number of independent agents is modelled. These agents' interactions sometimes cause unexpected "emergent" system behaviour. ABS is particularly suitable in the social context such as healthcare where a large number of human agents interact and co-operate for common goals. Today ABS in the social context is often used together with the recently introduced network analysis techniques and network visualization tools for modelling and simulating social agents within organisations. At Akdeniz University we are starting a number of projects for applying ABS technology in healthcare. In this paper we present two of the ongoing projects in this field. Firstly we have developed a prototype simulator for the long term monitoring of Chronic Obstructive Pulmonary Disease (COPD) as a major public health problem. We present the COPD simulator, its agents, parameters and working principles. Secondly we want to apply ABS and the network analysis techniques to visualise and explore informal social networks amongst staff at the Akdeniz University Hospital to assess and evaluate properties of the organisation in terms of its ability to innovate and share knowledge. In our applications, we primarily aim to use ABS in a web-based platform to create a virtual environment for discussion, visualising and running what-if scenarios to test out various options for managing healthcare, as well as sharing information and creating a virtual community.

Computer Simulation↗

PubMed1992

Do the sources of the urban elderly's social support determine its psychological consequences?

This article examines whether the psychological impact of different kinds of social supports varies according to who provides them. Data on 82 older adults' social relationships, measured as social provisions (Weiss, 1974), were used to evaluate whether the relationship between social provisions and emotional well-being varied when kin and, alternatively, nonkin, made the provisions. Findings showed that, although most social provisions were valuable regardless of their source, reassurance of worth was distinctly more beneficial when provided by nonkin than by kin, and reliable alliance, or instrumental assistance, was more strongly related to well-being when provided by kin than by nonkin. Analysis of social network structure showed that "multiplexity" was negatively related to well-being, and having duplicate providers for a given social provision was uniquely important in offsetting negative affect.

Activities of Daily Living↗

PubMedDate not supplied

[Contribution to the history of gerontology in Germany in the 2nd half of our century].

In this paper some trends of gerontology during the last 45 years in Germany are described. A survey of the development of gerontology in the former GDR is followed by an analysis of the "Zeitschrift für Alternsforschung" from 1980-1990. The main result is the predominance of publications on the care system since the middle of the 1980s. With regard to the development of gerontology in the western part of Germany, an analysis of publications in the "Zeitsschrift für Gerontologie" from 1968-1991 shows changes in the main topics during this period. Until the middle of the 1970s there was a predominance of publications in the field of: intelligence, learning, memory and perception. The emphasis of publications from 1977-1985 was on stress and coping. In the middle of the 1980s there was an increasing interest in the analysis of social network and competence in the elderly. The paper discusses these trends of gerontological research in the eastern and western parts of Germany.

Geriatrics↗

PubMed1984

Social-network considerations in the alcohol field.

This chapter reviews the literature on social networks in the alcohol field. The review focuses on the dynamics of the social-network system and network analysis. Stressors to recently urbanized persons are also examined in a discussion of social adaptation, social identity, and networks. The findings of several studies that are summarized indicate that there is a crisis in changing cultural styles and social values that develops after migration and resettlement. An aspect of this review suggests that social networks may be utilized as stress-buffering strategies in both a constructive and a destructive fashion during these periods of crisis. The author describes these networks as pathways to care and illustrates how they might play a significant role in alcoholism-treatment and recovery programs. Finally, the author concludes with some possible directions for future research on the systematic study of social bonds.

Alcohol Drinking↗

PubMed1984

Life events, social network, life-style, and health: an analysis of the 1979 National Survey of Personal Health Practices and Consequences.

The relationships among social structure, stress, social support, life-style health behavior, and health status are explored in this multivariate analysis of data from the National Survey of Personal Health Practices and Consequences. Path analyses showed social structural factors to influence life-style practices both directly and indirectly through social network and negative life events. For women, social network and life events had direct relationships to health related life-style practices, while age and income acted both directly and indirectly through social network and, for income, through life events. Education was also directly related to life-style. For men, social network and education had the only direct effects on health practices, and age and income had indirect effects through network. We then examined the relative contributions of the social network index elements, life events, and demographic variables to each of the life-style practices. These analyses confirmed the importance of gender, education, age, and income to predicting life-style behaviors. Negative life events were associated with smoking for both men and women, sleep for women only, and physical activity and alcohol use for men, which suggests sex-specific norms for coping with stress. For both sexes, church attendance and marriage were associated with favorable smoking and alcoholic use, implicating cognitive social support or social control as a mediator of health promotion. Finally, analyses for each gender using health status as the outcome variable indicated that age, income, education, and life events affected health directly, while the effects of church attendance and marriage were likely mediated through smoking and alcohol behaviors.

Attitude to Health↗

PubMed1998

Social support, social disability and their role as predictors of depression among patients with congestive heart failure.

The purpose of this study was to assess the effect of social support variables, personality, clinical variables (New York Heart Associations classification), and social disability upon depression. The sample consisted of 119 clinically stable patients (34 females, 85 males) with symptomatic heart failure, recruited from an outpatient hospital practice. The patients underwent a brief physical examination and completed a set of questionnaires. Descriptive statistics were used to characterise the patients' informal functional network. The analysis revealed that the intimate social network support (spouses) and primary social network support (close family) were rated as most supportive. Results from the path analysis showed that social disability was explained by the two personality factors, neuroticism and extraversion, and by the severity of disease (NYHA). No significant effects of the social support variables upon social disability were detected. Moreover, path-analyses showed that poor intimate network support, social disability and neuroticism were significantly positively associated with depression.

Adaptation, Psychological↗

PubMed1981

Social supports, social networks, and schizophrenia.

This article considers the meaning of "social support" and its relationship to social networks, and discusses a structural approach to analysis of social connections in the study of schizophrenia. The concept of social supports is seen as methodologically more problematic and less strategic than the more structurally oriented concepts of social networks and social connections. It is argued that in terms of research strategy, if social connections are studied structurally as they change and develop over time, the impact of the specifically social processes can be better separated from that of the personal characteristics of the focal individual than seems possible with other approaches. Analysis of the properties of the networks around the focal individual, independently of that individual's own social behavior, can help to disentangle the interwoven complex of causes, characteristics, and consequences of schizophrenia.

Dependency, Psychological↗

PubMed1997

Personality, social networks, and perceived social support among alcoholics: a structural equation analysis.

In this study we tested relations among personality characteristics, social network properties, and perceived social support both concurrently and prospectively. A sample of 294 men in treatment at a Department of Veterans Affairs Alcohol Treatment Unit was assessed during treatment and 3 months after discharge. Results of the cross-sectional structural equation analyses indicated that the personality characteristics of extraversion and neuroticism were related to both social network properties and perceived social support. Characteristics of the alcoholic's social network were also related to perceived availability of support. Longitudinal analyses of perceived social support after treatment indicated that two social network properties (size of the network and the proportion of confidants) were predictive net of initial levels of social support. Extraversion and neuroticism were found to be indirectly related to perceived social support at Time 2 through their effects on social network properties and perceived social support during treatment. Implications of these findings for models of the nature and determinants of perceived social support are discussed.

Adaptation, Psychological↗

PubMed1979

Social support and social adjustment: implications for mental health professionals.

The general importance of an individual's support network has been recognized in the field of community mental health; yet a more detailed understanding of how a client's available social ties may contribute to his or her adjustment is presently lacking. This study used network analysis to examine differences in the social networks of mental health clients to identify factors associated with positive social adjustment. Subjects were selected from three different types of mental health programs as well as from the general population of Marion County, Oregon. Results generally revealed that subjects from the community sample more often would look to immediate family members for support. Better functioning chronic clients emphasized professional contacts, whereas more poorly adjusted chronic clients would look to friends for support. The results have implications both for understanding the nature of the support available to a client and mobilizing the support resources of the existing network of relationships to aid adjustment to community living.

Adult↗

PubMed2000

Social networks, ideation, and contraceptive behavior in Bangladesh: a longitudinal analysis.

Longitudinal survey data from a panel of married women in Bangladesh is used to estimate the impact of a social network approach to family planning field worker communication and to test a theoretical model of behavior change that explains why women adopt modern contraceptives. Government field workers were trained to organize group discussions with women in the homes of opinion leaders located at central points in each village's social network. A set of intervening variables, referred to collectively as 'ideation', are derived from diffusion of innovation and social network theory to explain how the social network approach affects contraceptive behavior. The rate of increase in modern contraceptive use was found to be five times greater among women in the social network approach than among women who were visited by field workers at home. The impact of the social network approach on modern contraceptive use was almost double that of conventional field worker visits after controlling for the effects of prior contraceptive use and intention, prior home visits, and selected socio-demographic characteristics. Both approaches had the same degree of impact on ideation. The results confirm the influence of ideation on fertility change and suggest that family planning programs would benefit from training field workers to use a social network approach.

Adolescent↗