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

[Ben Pelzer]

Dear Maarten,

Take a look at

https://stats.idre.ucla.edu/r/examples/alda/r-applied-longitudinal-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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