Measurements on a Selection of Books
allbacks data frame gives measurements
on the volume and weight of 15 books, some of which
are softback (pb) and some of which are hardback (hb). Area
of the hardback covers is also included.
This data frame contains the following columns:
in cubic centimeters
hard board cover
areas in square centimeters
book weights in grams
a factor with levels
The bookshelf of J. H. Maindonald.
print("Multiple Regression - Example 6.1")
volume.split <- split(volume, cover)
weight.split <- split(weight, cover)
plot(weight.split$hb ~ volume.split$hb, pch=16, xlim=range(volume), ylim=range(weight),
ylab="Weight (g)", xlab="Volume (cc)")
points(weight.split$pb ~ volume.split$pb, pch=16, col=2)
pause()allbacks.lm <- lm(weight ~ volume+area)
allbacks.lm0 <- lm(weight ~ -1+volume+area, data=allbacks)
oldpar <- par(mfrow=c(2,2))
allbacks.lm13 <- lm(weight ~ -1+volume+area, data=allbacks[-13,])
round(coef(allbacks.lm0),2) # Baseline for changes
Dataset imported from https://www.r-project.org.