Displaying 2 results from an estimated 2 matches for "peter_mint".
2011 Nov 17
1
Log-transform and specifying Gamma
Dear R help,
I am trying to work out if I am justified in log-transforming data and specifying Gamma in the same glm.
Does it have to be one or the other?
I have attached an R script and the datafile to show what I mean.
Also, I cannot find a mixed-model that allows Gamma errors (so I cannot find a way of including random effects).
What should I do?
Many thanks,
Pete
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2011 Oct 04
1
Rug plot curve reversal
Dear R-help
Can anyone tell me why my curve appears the wrong way round on a rug plot?
I am using the same code as on pg 596 of the Crawley R-book.
mod<-glm(mort~logBd,binomial)
par(mfrow=c(2,2))
xv<-seq(0,8,0.01)
yv<-predict(mod,list(logBd=xv),type="response")
plot(logBd,mort)
lines(xv,yv)
I've tried swapping xv and yv around but no luck.
Thanks,
Pete