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2008 Jul 24
2
What is wrong with this contrast matrix?
...(-2,-2,0,-2,2,2,2),
c(-2,1,0,1,0,0,0),
c(0,-1,0,1,0,0,0))
should consist of orthogonal elements (as can be shown using %*% on the individual columns).
However, when I use
linhyp=linear.hypothesis(model, "explanatory.variable", P=P)
I get an error saying
Error in linear.hypothesis.mlm(mult1, "logdiv", P = P) :
The error SSP matrix is apparently of deficient rank = 4 < 6
Which I interpret as there are too many non-zero rows in the matrix, P.
Is that correct? And how can I assess if the matrix is orthogonal (given that it is non-symmetrical,
hence det(P) and other matrix...