[R-sig-ME] negative estimate from sd(resid(fit))

[ONKELINX, Thierry]

Dear Phil,

It's hard to tell what is going wrong, if we don't know what is going on. So give us a reproducible example of your problem.

Best regards,

Thierry

> -----Oorspronkelijk bericht-----
> Van: r-sig-mixed-models-bounces at r-project.org [mailto:r-sig-mixed-models-
> bounces at r-project.org] Namens Phil Smith
> Verzonden: woensdag 5 oktober 2011 10:15
> Aan: r-sig-mixed-models at r-project.org
> Onderwerp: [R-sig-ME] negative estimate from sd(resid(fit))
> 
> Hi lmer Club:
> 
> I've got a model like lmer( y ~ x , 1|cluster).
> 
> I'm permuting the cluster values 1000 times to obtain the nonparametric
> distribution of sigma under the null hypothesis that sigma = 0.
> 
> I'm getting alot of negative values!!
> 
> Am I doing something wrong, or what is going on there??
> 
> Please reply directly to Phil.Smith.Duluth.GA at gmail.com  .... I'm not too good at
> understanding listserves.
> 
> Thanks!
> Phil Smith
> CDC
> 
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> 
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