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3 results for “from:Rian Dickson”

Coefficient matrix not invertible
Rian Dickson · Jun 20, 2011 · r-sig-mixed-models

hello again, Thanks for the recent answers to my other questions - they've been quite useful. I've run into another problem a little further along. When I try to run this model: global.ri.vf1.cs1.lme <- lme(Log...

compound symmetry correlation structure in nlme
Rian Dickson · Jun 16, 2011 · r-sig-mixed-models

hello all, I am analyzing some data with repeated measures on individuals, and want to test different correlation structures. In Zuur et al (2007) they state "the inclusion of a random intercept in a GLM is imposing the compound symmetrical...

using AIC or AICc with lme to select random effects
Rian Dickson · Jun 6, 2011 · r-sig-mixed-models

hello all, This is my first post to the list, and I hope that I am not asking questions that are too elementary. I am using lme to run linear mixed models, and I want to use the AIC values...

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