[R-sig-Geo] Group-wise error variance and autocorrelation

[Santiago Beguería Portugués]

Hi Tim,

The nlme package allows to model the variance structure of the
within-group errors. It also allows to include spatial correlation
structures, in principle it is possible to define a grouping factor too,
although I've never used it.

Santiago Beguería Portugués


> Date: Wed, 18 Jul 2007 10:09:34 -0500
> From: "Tim Keitt" <tkeitt at gmail.com>
> Subject: [R-sig-Geo] Group-wise error variance and autocorrelation
> To: "R geostat list" <r-sig-geo at stat.math.ethz.ch>
> Message-ID:
> 	<6262c54c0707180809v4b7a1318o2547c793f5e45e48 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I'm trying to specify a model where the fixed effects are
>
> dep ~ group + group:indep
>
> and the error variance and spatial autocorrelation vary by group. I've
> tried lme but AFAICT it only supports heteroscedasticity and
> autocorrelation within groups. Any pointers?
>
> THK
>
>   


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