Hello,
I'm trying to use the bam() function in the R mgcv package for a large set of
grouped binary data. However, I have found that this function does not take
data in the format of cbind(numerator, denominator) on the left hand side of
the formula. As an example, consider the following
dat1 <- data.frame(id=rep(1:6, each=3), num=rbinom(18, size=10, prob=0.8),
den=rbinom(18, size=5, prob=0.5), x=rnorm(18))
m1.1 <- gam(cbind(num, den) ~ x+s(id, bs="re"), data=dat1, family=binomial)
m2.1 <- bam(cbind(num, den) ~x+ s(id, bs="re"), data=dat1, family=binomial)
Running the above results in
> dat1 <- data.frame(id=rep(1:6, each=3), num=rbinom(18, size=10, prob=0.8),
> den=rbinom(18, size=5, prob=0.5), x=rnorm(18))
> m1.1 <- gam(cbind(num, den) ~ x+s(id, bs="re"), data=dat1, family=binomial)
> m2.1 <- bam(cbind(num, den) ~x+ s(id, bs="re"), data=dat1, family=binomial)
Error in dev.resids(y, mu, weights) :
argument mu must be a numeric vector of length 1 or length 36
Is this a known issue? If so, is there a way to handle it?
Thank you,
Casey
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