[R] Function for linear mixed model with gamma-distributed random effects?

From: Christopher Hatherly <Christopher.Hatherly_at_anu.edu.au>
Date: Fri, 22 Feb 2008 09:05:10 +1100

I'm new to R and am hoping someone might be able to help with the following lme problem. I am trying to fit an ellipse equation to some spatial human factors data, varying the major and minor axes randomly and specifying an exp~ variogram for errors. Using normally-distributed random effects produces some -ve minor/major axes. I am hoping to be able to specify a gamma distribution to overcome this, but have not been able to work out how. Does anybody know an R function that implements lme with gamma-distributed random effects? Any help or advice would be greatly appreciated! Thanks

Chris Hatherly
PhD Candidate
Ageing Research Unit
Centre for Mental Health Research

Building 63, The Australian National University Canberra ACT 0200
Ph: 02 6125 1489
Fax: 02 6125 0733

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