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Modified Helmert contrast (or coding) matrix.
contr.helmod(n)
An orthogonal matrix with n rows and n - 1 columns. The columns form a basis of the subspace orthogonal to a vector of
n
n - 1
n ones.
Integer.
The returned matrix is a scaled version of contr.helmert(A).
contr.helmert(A)
A <- contr.helmod(6) crossprod(A)
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