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Title
Japanese:集団意思決定における提携の影響力比較 
English:Comparison of coalition influence on group decision 
Author
Japanese: 喜多村正仁, 猪原健弘.  
English: Masahito Kitamura, TAKEHIRO INOHARA.  
Language Japanese 
Journal/Book name
Japanese:経営情報学会2009年秋季全国研究発表大会予稿集 
English: 
Volume, Number, Page         pp. 296-299
Published date Nov. 14, 2009 
Publisher
Japanese: 
English: 
Conference name
Japanese:経営情報学会 2009年秋季全国研究発表大会 
English: 
Conference site
Japanese:広島 
English: 
Official URL http://www.jasmin.jp/activity/zenkoku_taikai/2009_fall/index.html
 
Abstract To compare influence of each coalition is an important topic in analysis of group decisions because it leads to appropriate analyses and estimations about the final decision and the coalition formation. In this paper, group decisions are mathematically modeled as simple games in the framework of the theory of cooperative games. A notion of coalition power index (CPI), which is extended from the concept of power index to enable evaluation of coalition influence, is employed for the comparison. This paper takes an example of group decision situations in reality and provides a specific calculation result of coalition influence, using the blockability index among other CPIs. Then, the result is compared to results of using other important power indices such as the Shapley-Shubik index.

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