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...balanced design (with the same number of case for each level of the factors)... So, if someone has been already in that case, any help would be appreciated ^^ Thanks. A.D. -- View this message in context: http://r.789695.n4.nabble.com/Design-of-experiments-for-Choice-Based-Conjoint-Analysis-CBC-tp2254077p2254077.html Sent from the R help mailing list archive at Nabble.com.