ex07.R
In ISwR: Introductory Statistics with R

walk <- unlist(zelazo) # or c(..,recursive=TRUE)
group <- factor(rep(1:4,c(6,6,6,5)), labels=names(zelazo))
summary(lm(walk ~ group))
t.test(zelazo$active,zelazo$ctr.8w) # first vs. last
t.test(zelazo$active,unlist(zelazo[-1])) # first vs. rest
fit <- lm(volume~method+subject, data=lung)
anova(fit)
summary(fit)  
kruskal.test(walk ~ group)
wilcox.test(zelazo$active,zelazo$ctr.8w) # first vs. last
wilcox.test(zelazo$active,unlist(zelazo[-1])) # first vs. rest
friedman.test(volume ~ method | subject, data=lung)
wilcox.test(lung$volume[lung$method=="A"],
            lung$volume[lung$method=="C"], paired=TRUE) # etc.
attach(juul)
tapply(sqrt(igf1),tanner, sd, na.rm=TRUE)
plot(sqrt(igf1)~jitter(tanner))
oneway.test(sqrt(igf1)~tanner)
rm(list=ls())
while(search()[2] != "package:ISwR") detach()