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What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure?

Phillip Alday 
I'm also somewhat curious whether these really count as "unstructured"
(subject to the terminological issues pointed out by D. Bates)
covariance matrices. The gls examples seem to be imposing additional
constraints (such as setting the residual variance to 0 via varIdent())
to overcome these issues.

(As a sidebar, I'm not sure replicating pairwise correlation is what we
should aim for in the covariance structure of mixed-effects models.
Forcing us to match pairwise correlation/regression structure seems to
be forcing us to reduce a lot of the advantages of things like partial
pooling, shrinkage, etc. in mixed-effects models.)

Going back to the original question, is this really the same thing as
the "unstructured" covariance in SPSS? If so, how does SPSS allow for
"unstructured" covariance that has non-zero residual variance? Or in
terms of R, how would one distinguish terminologically between the lme4
"unstructured" and the gls "unstructured but residual constrained to zero"?

Best,
Phillip
On 22/03/18 11:03, Maarten Jung wrote:

Thread (14 messages)

Douglas Bates What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 20 Rune Haubo What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 21 Ben Pelzer What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 21 Maarten Jung What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 21 Ben Pelzer What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 21 Maarten Jung What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22 Ben Pelzer What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22 Maarten Jung What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22 Phillip Alday What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22 Ben Pelzer What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22 Rune Haubo What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22 Maarten Jung What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22 Rune Haubo What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22 Maarten Jung What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure? Mar 22