... Irvine,California, USA Social network analysis is a large and growing body of research on the measurement and analysis of relationalstructure. Here, we review the fundamental concepts of network analysis, ... for linearregression, principal component analysis, canonical corre-lation analysis, or other linear subspace analyses, just as inconventional multivariate analysis (Mardia, Kent, & Bibby,1979). ... concepts and methodsof social network analysis. Attention is given to problemsof network definition and data collection, as well as data analysis per se, as these issues are particularly relevant...