Modeling error structure in lmer in R?

Question

Is it possible to add a parameter to lmer model which will be modeling the error structure? Sth similar to TOEP(X) and SP(POW) from SAS???

I don't think so, but Ben Bolker might correct me. However, covariance structures can be specified with lme from the nlme package. See also: http://stats.stackexchange.com/a/49793/11849 — Roland, Dec 16 '14 at 09:56
For future reference and for the SAS-impaired, it would be nice to describe what TOEP(X) and SP(POW) statements actually do (I'm guessing a Toeplitz structure and some kind of spatial power autocorrelation function)? — Ben Bolker, Dec 17 '14 at 03:24
As you wrote Ben Bolker. The first one is Toeplitz and the second is spatial power — Legionista, Dec 17 '14 at 07:11

score 3 · Accepted Answer · answered Dec 16 '14 at 10:04

3

No, there is no such parameter. However, you could try nlme library, the ancestor of lmer. nlme library enables you to define a correlation structure, e.g. Gaussian, Autoregressive, or ARMA.

For detailed description, tutorial and examples check this book: Pinheiro, J.C., and Bates, D.M. (2000). Mixed-Effects Models in S and S-PLUS. Springer.

You can also find some examples here and here.

answered Dec 16 '14 at 10:04

Tim

138,066

Why would the ancestor be more powerful than the latest ? Is this a choice or is this pending ? – Dan Chaltiel Sep 17 '18 at 10:15
@DanChaltiel don't ask me about the decisions made by the designers of both packages... – Tim Sep 17 '18 at 10:18

Modeling error structure in lmer in R?

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