[R-sig-ME] What is the lmer/nlme equivalent of the REPEATED subcommand in SPSS's MIXED procedure?

[Maarten Jung]

Dear Ben, dear Phillip,

comparing [1] with [2] I think the /REPEATED command specifies the error
(co)variance structure of the model. Would you agree with that?
If so, AFAIK this is not possible with lmer and thus the answer on Stack
Overflow [3] would be wrong.

[1]
https://stats.idre.ucla.edu/r/examples/alda/r-applied-longitudinal-data-analysis-ch-7/
[2]
https://stats.idre.ucla.edu/spss/examples/alda/chapter7/applied-longitudinal-data-analysis-modeling-change-and-event-occurrenceby-judith-d-singer-and-john-b-willett-chapter-7-examining-the-multilevel-model-s-erro/
[3]
https://stackoverflow.com/questions/48518514/what-is-the-lmer-nlme-equivalent-of-the-repeated-subcommand-in-spsss-mixed-proc

Regards,
Maarten

On Tue, Mar 20, 2018 at 2:10 PM, Ben Pelzer <b.pelzer at maw.ru.nl> wrote:

> Dear Maarten,
>
> Take a look at
>
> https://stats.idre.ucla.edu/r/examples/alda/r-applied-longit
> udinal-data-analysis-ch-7/
>
> which shows you a number of covariance structures, among which is the
> unstructured matrix, for repeated measures in R with lme. It refers to
> chapter 7 of Singer and Willett where they discuss all these different
> structures and how to choose among them. Regards,
>
> Ben.
>
> On 20-3-2018 9:00, Maarten Jung wrote:
>
>> Dear list,
>> I came across a SPSS syntax like this
>>
>> MIXED value BY factor1
>>      /CRITERIA=CIN(95) MXITER(100) MXSTEP(10) SCORING(1)
>> SINGULAR(0.000000000001)
>>      HCONVERGE(0, ABSOLUTE) LCONVERGE(0, ABSOLUTE) PCONVERGE(0.000001,
>>      ABSOLUTE)
>>      /FIXED=factor1 | SSTYPE(3)
>>      /METHOD=REML
>>      /REPEATED=factor1 | SUBJECT(participant) COVTYPE(UN).
>>
>> and struggle to find an equivalent lmer/nlme (or R in general) formulation
>> for this kind of models.
>> Does anybody know how to convert the REPEATED subcommand into R code?
>>
>> Please note that I asked the question on Stack Overflow about two month
>> ago:
>> https://stackoverflow.com/questions/48518514/what-is-the-
>> lmer-nlme-equivalent-of-the-repeated-subcommand-in-spsss-mixed-proc
>>
>> Best regards,
>> Maarten
>>
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>>
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