Compute a list of canonical covariance matrices
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a mash data object, eg as created by
a vector of strings indicating the matrices to
be used: "identity" for the identity (effects are independent among
conditions); "singletons" for the set of matrices with just one
non-zero entry x_jj = 1 (j=1,...,R); (effect specific to
condition j); "equal_effects" for the matrix of all 1s (effects are
equal among conditions); "simple_het" for a set of matrices with 1s
on the diagonal and all off-diagonal elements equal to 0.25, 0.5 or
The default is that this function computes covariance matrices corresponding to the "bmalite" models.
a list of covariance matrices
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