At the top of page 283 of Pinheiro and Bates, a covariance structure for
the indomethicin example is specified as
random = pdDiag(A1 + lrc1 + A2 + lrc2 ~ 1)
The argument to pdDiag() looks like a two-sided formula, and I'm struggling
to reconcile this with the syntax described in Ch4 of the book and online.
Further down page 283 the formula is translated into
list(A1 ~ 1, lrc1 ~ 1, A2 ~ 1, lrc2 ~ 1)
which I find just as puzzling. Can anyone help?
--
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