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...atrix for groups x,y,z. I know how to do it the long way. I tried to use tapply and kmeans but no good results. (tapply is a good solution for only 1 variable) Thank you Bogdan -- View this message in context: http://n4.nabble.com/how-do-I-calculate-means-or-cov-matrix-for-multivariate-groups-tp1564157p1564157.html Sent from the R help mailing list archive at Nabble.com.