search for: mixedeffect

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2006 Oct 05
2
treatment effect at specific time point within mixedeffects model
...bounces at stat.math.ethz.ch > [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of > Afshartous, David > Sent: Thursday, October 05, 2006 11:08 AM > To: Spencer Graves > Cc: r-help at stat.math.ethz.ch > Subject: Re: [R] treatment effect at specific time point > within mixedeffects model > > Hi Spencer, > > Thanks for your reply. > I don't think this answers my question. > > If I understand correctly, your model simply removes the > intercept and thus the intercept in fm1 is the same as the > first time factor in fm1a ... but am I confused...
2002 Jul 05
1
robust mixed effects models
I'd like to apply the ideas of Pinheiro et al. (1997): "Robust Estimation in LInear Mixed Effects Models using the Multivariate t-Distribution" and I'm wondering if the EM-based estimation described in that paper has been implemented by somebody in R already (I'm assuming it's not yet available within the package nlme -- whose subtitle is "Fit and compare
2012 May 21
1
Syntax for lme function to model random factors and interactions
Hello, I have a question regarding the syntax of the lme function in the nlme package. What I'm trying to do is to calculate an estimate of R^2 based on the likelihood ratio test. For this calculation, I need to determine the maximum log-likelihood of the intercept-only model and the model of interest (with the desired factors and interactions). My model has four independent factors (i.e. A,