Hi
I am trying to run an ANOVA on data with unequal variance. I am new to nlme,
but to my understanding I need to use the gls function. I have single response
variable (distance which is continuous) and the explanatory variable is
individual ID (class variable: individuals differ in the variance in their
distance values hence the need to using nlme).
So I would create a model Distance~Individual ID and then create a variance
structure to add to the model. However the variance structure is not a linear
relationship, it is simply a series of variances linked to individual ID. Can
anyone guide me as to how to fit this into the model? As the model is very
simple, I think that the variance is the only component I need to estimate for
the model, but perhaps I am mistaken?
Thanks
Sam
Dr Samantha Patrick
EU INTERREG Post Doc
Davy 618
Marine Biology & Ecology Research Centre
University of Plymouth
Plymouth
PL4 8AA
T: 01752 584699
M: 07740472719
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