cuckoos {DAAG} | R Documentation |
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:
hedge.sparrow
,
meadow.pipit
,
pied.wagtail
,
robin
,
tree.pipit
,
wren
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 normality