Dear R-Users,

Dr. Wood replied to a similar topic before where confidence intervals were
for a ratio of two treatments (
https://stat.ethz.ch/pipermail/r-help/2011-June/282190.html). But my
question is more complicated than that one. In my case, log(E(y)) = s(x)
where y is a smooth function of x. What I want is the confidence interval
of a ratio of log[(E(y2))/E(y1)] given two fixed x values of interest. This
is complicated than two treatments because they can be modeled as a binary
variable as Dr. Wood pointed out. I am wondering if mgcv has some embedded
functions to calculate this quickly.

Best regards,
Gevin

2012-05-23

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