Cuckoo Eggs Data
Length and breadth measurements of 120 eggs lain in the nests of six different species of host bird.
cuckoos
This data frame contains the following columns:
the egg lengths in millimeters
the egg breadths in millimeters
a factor with levels
hedge.sparrow,
meadow.pipit,
pied.wagtail,
robin,
tree.pipit,
wren
a numeric vector
Latter, O.H. (1902). The eggs of Cuculus canorus. An Inquiry into the dimensions of the cuckoo's egg and the relation of the variations to the size of the eggs of the foster-parent, with notes on coloration, &c. Biometrika i, 164.
Tippett, L.H.C. 1931: "The Methods of Statistics". Williams & Norgate, London.
print("Strip and Boxplots - Example 2.1.2")
attach(cuckoos)
oldpar <- par(las = 2) # labels at right angle to axis.
stripchart(length ~ species)
boxplot(split(cuckoos$length, cuckoos$species),
xlab="Length of egg", horizontal=TRUE)
detach(cuckoos)
par(oldpar)
pause()
print("Summaries - Example 2.2.2")
sapply(split(cuckoos$length, cuckoos$species), sd)
pause()
print("Example 4.1.4")
wren <- split(cuckoos$length, cuckoos$species)$wren
median(wren)
n <- length(wren)
sqrt(pi/2)*sd(wren)/sqrt(n) # this s.e. computation assumes normalityPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.