“…In recent years, the use of multivariate techniques for data exploration has increased, including correspondence analysis, principal components, cluster analysis and discriminant analysis (Prior and Price-Williams, 1985;Jones, 1987Jones, , 1991Heinz and Thié bault, 1998;Scheel-Ybert, 2000;Asouti, 2003). In other cases, contingency tables and four-way log-linear analysis have been employed to explore categorical variables (Kohler and Matthews, 1988).…”