Graph Theory

Graph Theory in Modern Engineering: Computer Aided Design, by Henley

By Henley

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Additional info for Graph Theory in Modern Engineering: Computer Aided Design, Control, Optimization, Reliability Analysis

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Are these people total strangers? (Burt 1985, page 120) Such measurements give rise to ego-centered networks Small World. Special network designs are also used in small world and reverse small world studies. A small world study is an attempt to determine how many actors a respondent is removed from a target individual based on acquaintanceship. Of primary interest is not only how long these "chains" are, but also the characteristics of the intermediate actors in the chain. This data collection design was pioneered by Milgram (Milgram 1967; Travers and Milgram 1969).

Or, the ctors might not even he memhers of a well-defined set of actors. Clearly these instances, we are not studying a network with a boundary. We fer to such studies as special network designs. In the next paragraphs, we discuss data collection procedures for ognitive social structure designs, experimental, ego-centered networks, nd small- and reverse small-world techniques. Cognitive Social Structure. In a standard sociometric questione, one asks respondents about their own ties. A variation of this esign is to ask respondents to give information on their perceptions f other actors' network ties.

The first example illustrating the problem of identifying the relevant population of actors comes from a study of how information or new ideas diffuse through a community. Coleman, Katz, and Menzel (1957) studied how a new drug was adopted by physicians. Their solution to the problem of boundary identification is as i'ollows: It was decided to include in the sample, as nearly as possible, all the local doctors in whose specialities the new drug was of major potential significance. This assured that the "others" named by each doctor in answer to the sociometric questions were included in the sample.

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