Dewpoint Data
The dewpoint data frame has 72 rows and 3 columns.
Monthly data were obtained for a number of sites (in Australia)
and a number of months.
dewpoint
This data frame contains the following columns:
monthly minimum temperatures
monthly maximum temperatures
monthly average dewpoint for each combination of minimum and maximum temperature readings (formerly dewpoint)
Dr Edward Linacre, visiting fellow in the Australian National University Department of Geography.
print("Additive Model - Example 7.5")
require(splines)
attach(dewpoint)
ds.lm <- lm(dewpt ~ bs(maxtemp,5) + bs(mintemp,5), data=dewpoint)
ds.fit <-predict(ds.lm, type="terms", se=TRUE)
oldpar <- par(mfrow=c(1,2))
plot(maxtemp, ds.fit$fit[,1], xlab="Maximum temperature",
ylab="Change from dewpoint mean",type="n")
lines(maxtemp,ds.fit$fit[,1])
lines(maxtemp,ds.fit$fit[,1]-2*ds.fit$se[,1],lty=2)
lines(maxtemp,ds.fit$fit[,1]+2*ds.fit$se[,1],lty=2)
plot(mintemp,ds.fit$fit[,2],xlab="Minimum temperature",
ylab="Change from dewpoint mean",type="n")
ord<-order(mintemp)
lines(mintemp[ord],ds.fit$fit[ord,2])
lines(mintemp[ord],ds.fit$fit[ord,2]-2*ds.fit$se[ord,2],lty=2)
lines(mintemp[ord],ds.fit$fit[ord,2]+2*ds.fit$se[ord,2],lty=2)
detach(dewpoint)
par(oldpar)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.