On Mar 12, 2009, at 11:45 AM, David Winsemius wrote:
On Mar 12, 2009, at 11:14 AM, Michael Denslow wrote:
# I am not sure how to get the lines to draw correctly here
matlines(pred.frame$a,pp, lty=c(1,2,2),col="black")
The x values are your sequence whereas the y values are in the
sequence from the original data. They are not correctly associated
with each other.
Try:
pp <- predict(lm(wt.data$logS~wt.data$logA), int = "p", newdata=
data.frame(logA=seq(0,6, length.out = 24)) )
plot(pp)
At this point I should not have accepted your starting point. A better
starting point would be to use the wt.mod model:
pp <- predict(wt.mod, int = "p", newdata= list(logA=seq(0,6,
length.out = 24)) )
# Followed by:
plot( seq(0,6, length.out = 24), pp[ ,"fit"] )
lines(seq(0,6, length.out = 24), pp[ ,"lwr"], lty=2)
lines(seq(0,6, length.out = 24), pp[ ,"upr"], lty=2)
--
david winsemius
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
