[R] Checking for orthogonal contrasts

S Ellison S.Ellison at lgc.co.uk
Fri Dec 3 14:47:55 CET 2010

A common point made in discussion of contrasts, type I, II, III SS etc
is that for sensible comparisons one should use contrasts that are 
'orthogonal in the row-basis of the model matrix' (to quote from

Question: How would one check, in R, that this is so for a particular
fitted linear model object?

Steve Ellison

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