allbacks {DAAG} | R Documentation |
The 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.
allbacks
This data frame contains the following columns:
hb
hardback, pb
paperbackThe bookshelf of J. H. Maindonald.
print("Multiple Regression - Example 6.1") attach(allbacks) 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) summary(allbacks.lm) detach(allbacks) pause() anova(allbacks.lm) pause() model.matrix(allbacks.lm) pause() print("Example 6.1.1") allbacks.lm0 <- lm(weight ~ -1+volume+area, data=allbacks); summary(allbacks.lm0) pause() print("Example 6.1.2") oldpar <- par(mfrow=c(2,2)) plot(allbacks.lm0) par(oldpar) allbacks.lm13 <- lm(weight ~ -1+volume+area, data=allbacks[-13,]) summary(allbacks.lm13) pause() print("Example 6.1.3") round(coef(allbacks.lm0),2) # Baseline for changes round(lm.influence(allbacks.lm0)$coef,2)