need means on all boxplots, but only half of them got that

________________________________________

boxplot( Daten$weight~interaction(Daten$Dosis,Daten$sex, drop=TRUE))
means<-tapply( Daten$weight, Daten$Dosis, mean)
points(means, pch=5, col="red", lwd=5)

...only the boxplots for male got that point on them, 
its really weird because I don't think that I separated the sex in the codes above

Look again; the boxplot is clearly distinguished by sex.

Try 
means<-tapply( Daten$weight, interaction(Daten$Dosis,Daten$sex, drop=TRUE), mean)

S Ellison

*******************************************************************
This email and any attachments are confidential. Any use...{{dropped:8}}