以下の二つの論文で扱われたデータセット。やはり、因子分析に向いたものとしてしましまさんから久保山さんにお薦めがありました。
-- M. Zanker, M.Jessenitschnig, D. Jannach and S. Gordea, Comparing Recommendation Strategies in a Commercial Context, IEEE Intelligent Systems, 2007, vol. 22, May/June.
-- M. Zanker, M.Jessenitschnig, Collaborative feature-combination recommender exploiting explicit and implicit user feedback, 11th IEEE Conference on Commerce and Enterprise Computing (CEC), Vienna, Austria, 2009.
Hanneman, Robert A. and Mark Riddle. 2005. Introduction to social network methods. Riverside, CA: University of California, Riverside (published in digital form at http://faculty.ucr.edu/~hanneman/)