negative estimate from sd(resid(fit))

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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negative estimate from sd(resid(fit))

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