* '''ade4''' ''(Multivariate analysis of qualitative, quantitative and presence/absence data based on principal components analysis, correspondence analysis and multiple correspondence analysis)'' http://pbil.univ-lyon1.fr/ADE-4/home.php?lang=eng | * '''ade4''' ''(Multivariate analysis of qualitative, quantitative and presence/absence data based on principal components analysis, correspondence analysis and multiple correspondence analysis)'' http://pbil.univ-lyon1.fr/ADE-4/home.php?lang=eng |