Dear R users,
Prof. Ripley just corrected my understanding of the use of weights in glm,
which I thought would allow me to correctly use lmer. However I'm still
having problems.
My data takes the form of # of infected and uninfected individuals that
were measured over time under different treatments. I'm using lmer to
adjust for the repeated measures over time.
In fitting the model:
> model1=lmer(y~treatment+(time | ID),family=binomial,weights = total)
where y = proportion of animals infected (number infected/total)
total = number of infected + number uninfected
this returns the error:
Error in lmer(y ~ treatment + (time | ID), family = binomial, weights =
total) :
object `weights' of incorrect type
Can anyone tell me what's wrong with the weights?
cheers,
Chris
Chris O'Brien
Sonoran Desert Research Station and
School of Natural Resources
Biological Sciences, room 125
University of Arizona
Tucson, AZ 85721
work (520) 623-3720
[EMAIL PROTECTED]
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