Dear SList:
Thanks to Jose Pinheiro, Joel Dubin,Douglas Bates, Bruce McCullough,and
Frank Ashford for their replies.
As Jose Pinheiro and Joel Dubin pointed out, the right expression is:
lme(fixed = Dif ~ DifLag1+DifLag2, cluster = ~Contract,
data = CCDeliveryPeriod,
control=list(max.iter=100, ms.max.iter = 100, verbose = T))
(note: the help file is not correct, the above expression should be
followed when there is difference between the help file and the above.
(When I first receive reply from Joel Dubin, I thought max.iter in his
e-mail is a typo for maxiter because the help file say "maxiter".
Obviously it didnot work correctly for me. So I sent another help request
later. Thanks to Jose Pinheiro for explaining what exactly is going on to
me.))
Both Jose Pinheiro and Douglas Bates suggest that the Version 3.0 of NLME
performs better. The new version can be downloaded at
http://nlme.stat.wisc.edu/
Thanks again for all the replies I got.
---Sharon Cavenaugh
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