Monday, 11 November 2013

Mathematical Sociology and the evolution of Social Network Analysis

The study of human social behaviour and its origins, development, organizations, and institutions is known as Sociology. It is a science which uses various methods of investigation and analysis to understand human social actions, social structure and functions.
The usage of mathematics to construct social theories is termed as Mathematical Sociology. The problem with sociological theory is that it is strong in intuitive content but weak from a formal point of view. Mathematical Sociology aims to take sociological theory and express it in formal terms. This approach helps to increase the clarity and use mathematics to derive implications of a theory that cannot be arrived at intuitively.
            This method needs making some specific assumptions about some social phenomenon, expressing them in mathematical terms, and providing an empirical interpretation for the ideas. It also means deducing properties of the model and comparing these with relevant empirical data.

            One of the major contributions of Mathematical Sociology is Social network analysis. Social network analysis is a methodical analysis of social networks. It represents social relationships in terms of networks. The nodes of the network are the individual actors. For example in the analysis of a friends’ network of a person on Facebook, all the friends in the person’s friends list are the nodes of the network. The relationship between the nodes i.e., friends in the above example are represented by edges between the nodes. This analysis uses various metrics like Centrality, Multiplexity, Density, Distance, Clustering Coefficient, cohesion, propinquity, mutuality, homophily, etc. These metrics help in comparing a network with others and get valuable insights. Visual representation of these networks will help in better understanding these networks and will also give valuable insights. Many of the analytical software like gephi have modules for network visualisation. Social network analysis has emerged as a key technique in modern sociology. It has also gained a significant following in anthropology, biology, communication studies, economics, geography, history, information science, organizational studies, political science, social psychology, development studies, and sociolinguistics and is now commonly available as a consumer tool.

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