画 報 Library and Information Science No.47 2002 大規模文献集合に対して階層的クラスタ分析法を 適用するための単連結法アルゴリズム A Single−Link Method Algorithm for Clustering Large Document Collections 岸 田 和 明 Kaguaki Kishida Re−sume’ In the 1960s and 1970s, techniques for clustering a set of documents, in order to improve the effectiveness or efficiency of information retrieval systems, have been widely explored.