Re: [R] how to set the starting value in lme

From: Ben Bolker <bbolker_at_gmail.com>
Date: Wed, 16 Mar 2011 12:29:30 +0000

Daniel Kaschek <daniel.kaschek <at> physik.uni-freiburg.de> writes:

>
> Hi Jia,
>
> in order to test if the failing parameter estimation really has to do
> with wrong initial values, you could first simulate data with your mixed
> effects model. Just assume parameters, produce a data set with these
> parameters, add noise and look if you can estimate the parameters
> correctly with varying initial guesses.
>

  PS. Correlations between random effects close to 1.0 (or -1.0) are usually a sign of insufficient data. Further questions along these lines should probably go to the r-sig-mixed-models list ...



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