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???
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Legionista
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2I 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
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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
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As you wrote Ben Bolker. The first one is Toeplitz and the second is spatial power – Legionista Dec 17 '14 at 07:11
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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.
Tim
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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
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@DanChaltiel don't ask me about the decisions made by the designers of both packages... – Tim Sep 17 '18 at 10:18