Further to my posting yesterday I think I have figured this out to my
satisfaction when I compare with SAS output.
The hat elements are the diagonals of WC(superscript: -1)W', the variances of
predicted values. So to get var(ehat)/var(e) one needs to divide the hat value
by the residual variance and multiply by the weight (for a weighted analysis)
before subtracting from 1.
I think this is probably what is intended on page 127 of the manual.
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