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Dear Listers, Could anyone advise if this is the 'correct' contrast matrix to use to make contrasts between one treatment and the mean of 2 other treatments (in this case, mid-parent values to the F1 and F2 from a line cross experiment)? Desired contrasts are 1) P1 versus P2 2) average of P1 and P2 versus F1 3) average of P1 and P2 versus F2 levels(MyData$Type) "P1",