> summary.aov(aovRes, split=list(interval = list("i1 vs i2" = 1, "i2 vs > i3" = 2, "i3 vs i4" = 3, "i4 vs i5" = 4, "i5 vs i6" = 5))) >try class(aovRes) #-> aovlist ! summary.aovlist(aovRes, spit=...) or simply summary(aovRes, spit=...) Hoping this helps, Herwig -- Dr. Herwig Meschke Wissenschaftliche Beratung Hagsbucher Weg 27 D-89150 Laichingen phone +49 7333 210 417 / fax +49 7333 210 418 email HerwigMeschke at t-online.de