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Parameters are given in terms of the prevalence of small subgraph configurations in the network and can be interpreted as describing the combinations of local social processes from which a given network emerges. These probability models for networks on a given set of actors allow generalization beyond the restrictive dyadic independence assumption of micro-networks, allowing models to be built from theoretical structural foundations of social behavior.
Scale-free networks : A scale-free network is a network whose degree distribution follows a power law , at least asymptotically. In network theory a scale-free ideal network is a random network with a degree distribution that unravels the size distribution of social groups. One notable characteristic in a scale-free network is the relative commonness of vertices with a degree that greatly exceeds the average. The highest-degree nodes are often called "hubs", and may serve specific purposes in their networks, although this depends greatly on the social context.
Another general characteristic of scale-free networks is the clustering coefficient distribution, which decreases as the node degree increases.
This distribution also follows a power law. Rather than tracing interpersonal interactions, macro-level analyses generally trace the outcomes of interactions, such as economic or other resource transfer interactions over a large population. Large-scale networks : Large-scale network is a term somewhat synonymous with "macro-level" as used, primarily, in social and behavioral sciences, in economics.
Originally, the term was used extensively in the computer sciences see large-scale network mapping. Complex networks : Most larger social networks display features of social complexity , which involves substantial non-trivial features of network topology , with patterns of complex connections between elements that are neither purely regular nor purely random see, complexity science , dynamical system and chaos theory , as do biological , and technological networks.
Such complex network features include a heavy tail in the degree distribution , a high clustering coefficient , assortativity or disassortativity among vertices, community structure see stochastic block model , and hierarchical structure. In the case of agency-directed networks these features also include reciprocity , triad significance profile TSP, see network motif , and other features. In contrast, many of the mathematical models of networks that have been studied in the past, such as lattices and random graphs , do not show these features.
Various theoretical frameworks have been imported for the use of social network analysis. The most prominent of these are Graph theory , Balance theory , Social comparison theory, and more recently, the Social identity approach. Few complete theories have been produced from social network analysis. Two that have are structural role theory and heterophily theory.
The basis of Heterophily Theory was the finding in one study that more numerous weak ties can be important in seeking information and innovation, as cliques have a tendency to have more homogeneous opinions as well as share many common traits. This homophilic tendency was the reason for the members of the cliques to be attracted together in the first place.
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However, being similar, each member of the clique would also know more or less what the other members knew. To find new information or insights, members of the clique will have to look beyond the clique to its other friends and acquaintances. This is what Granovetter called "the strength of weak ties". In the context of networks, social capital exists where people have an advantage because of their location in a network.
Contacts in a network provide information, opportunities and perspectives that can be beneficial to the central player in the network. Most social structures tend to be characterized by dense clusters of strong connections. Non-redundant information is most often obtained through contacts in different clusters.
An ideal network structure has a vine and cluster structure, providing access to many different clusters and structural holes. Networks rich in structural holes are a form of social capital in that they offer information benefits.
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The main player in a network that bridges structural holes is able to access information from diverse sources and clusters. This concept is similar to Mark Granovetter's theory of weak ties , which rests on the basis that having a broad range of contacts is most effective for job attainment. Communication Studies are often considered a part of both the social sciences and the humanities, drawing heavily on fields such as sociology , psychology , anthropology , information science , biology , political science , and economics as well as rhetoric , literary studies , and semiotics.
Many communication concepts describe the transfer of information from one source to another, and can thus be conceived of in terms of a network. Barnes' day, a " community " referred to a specific geographic location and studies of community ties had to do with who talked, associated, traded, and attended church with whom.
Today, however, there are extended "online" communities developed through telecommunications devices and social network services. Such devices and services require extensive and ongoing maintenance and analysis, often using network science methods. Community development studies, today, also make extensive use of such methods.
Complex networks require methods specific to modelling and interpreting social complexity and complex adaptive systems , including techniques of dynamic network analysis. Mechanisms such as Dual-phase evolution explain how temporal changes in connectivity contribute to the formation of structure in social networks. In criminology and urban sociology , much attention has been paid to the social networks among criminal actors. For example, Andrew Papachristos  has studied gang murders as a series of exchanges between gangs. Murders can be seen to diffuse outwards from a single source, because weaker gangs cannot afford to kill members of stronger gangs in retaliation, but must commit other violent acts to maintain their reputation for strength.
Diffusion of ideas and innovations studies focus on the spread and use of ideas from one actor to another or one culture and another.
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This line of research seeks to explain why some become "early adopters" of ideas and innovations, and links social network structure with facilitating or impeding the spread of an innovation. In demography , the study of social networks has led to new sampling methods for estimating and reaching populations that are hard to enumerate for example, homeless people or intravenous drug users. For example, respondent driven sampling is a network-based sampling technique that relies on respondents to a survey recommending further respondents.
The field of sociology focuses almost entirely on networks of outcomes of social interactions. More narrowly, economic sociology considers behavioral interactions of individuals and groups through social capital and social "markets". Sociologists, such as Mark Granovetter, have developed core principles about the interactions of social structure, information, ability to punish or reward, and trust that frequently recur in their analyses of political, economic and other institutions.
Granovetter examines how social structures and social networks can affect economic outcomes like hiring, price, productivity and innovation and describes sociologists' contributions to analyzing the impact of social structure and networks on the economy.
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Analysis of social networks is increasingly incorporated into health care analytics , not only in epidemiological studies but also in models of patient communication and education, disease prevention, mental health diagnosis and treatment, and in the study of health care organizations and systems. Human ecology is an interdisciplinary and transdisciplinary study of the relationship between humans and their natural , social , and built environments. The scientific philosophy of human ecology has a diffuse history with connections to geography , sociology , psychology , anthropology , zoology , and natural ecology.
Studies of language and linguistics , particularly evolutionary linguistics , focus on the development of linguistic forms and transfer of changes, sounds or words, from one language system to another through networks of social interaction. In the study of literary systems, network analysis has been applied by Anheier, Gerhards and Romo,  De Nooy,  and Senekal,  to study various aspects of how literature functions.
The basic premise is that polysystem theory, which has been around since the writings of Even-Zohar , can be integrated with network theory and the relationships between different actors in the literary network, e. Research studies of formal or informal organization relationships , organizational communication , economics , economic sociology , and other resource transfers.
Social networks have also been used to examine how organizations interact with each other, characterizing the many informal connections that link executives together, as well as associations and connections between individual employees at different organizations. Social capital is a form of economic and cultural capital in which social networks are central, transactions are marked by reciprocity , trust , and cooperation , and market agents produce goods and services not mainly for themselves, but for a common good.
Social capital is a sociological concept about the value of social relations and the role of cooperation and confidence to achieve positive outcomes. The term refers to the value one can get from their social ties. For example, newly arrived immigrants can make use of their social ties to established migrants to acquire jobs they may otherwise have trouble getting e. A positive relationship exists between social capital and the intensity of social network use. In many organizations , members tend to focus their activities inside their own groups, which stifles creativity and restricts opportunities.
A player whose network bridges structural holes has an advantage in detecting and developing rewarding opportunities. British philosopher and political economist John Stuart Mill , writes, "it is hardly possible to overrate the value Such communication [is] one of the primary sources of progress. This in turn, helps an individual's career development and advancement. A social capital broker also reaps control benefits of being the facilitator of information flow between contacts. In the case of consulting firm Eden McCallum, the founders were able to advance their careers by bridging their connections with former big three consulting firm consultants and mid-size industry firms.
There has been research that both substantiates and refutes the benefits of information brokerage. A study of high tech Chinese firms by Zhixing Xiao found that the control benefits of structural holes are "dissonant to the dominant firm-wide spirit of cooperation and the information benefits cannot materialize due to the communal sharing values" of such organizations. Information and control benefits of structural holes are still valuable in firms that are not quite as inclusive and cooperative on the firm-wide level. In , Ronald Burt studied managers who ran the supply chain for one of America's largest electronics companies.
He found that managers who often discussed issues with other groups were better paid, received more positive job evaluations and were more likely to be promoted. Computer networks combined with social networking software produces a new medium for social interaction. The content of a relation refers to the resource that is exchanged. In a computer mediated communication context, social pairs exchange different kinds of information, including sending a data file or a computer program as well as providing emotional support or arranging a meeting.
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With the rise of electronic commerce , information exchanged may also correspond to exchanges of money, goods or services in the "real" world. In addition, the sheer size and the volatile nature of social media has given rise to new network metrics. A key concern with networks extracted from social media is the lack of robustness of network metrics given missing data. From Wikipedia, the free encyclopedia. Theoretical concept in sociology. This article is about the theoretical concept as used in the social and behavioral sciences.
For social networking sites, see Social networking service. For the movie, see The Social Network. For other uses, see Social network disambiguation. Metrics Algorithms.