cuckoos | 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:

- length
the egg lengths in millimeters

- breadth
the egg breadths in millimeters

- species
a factor with levels

`hedge.sparrow`

,`meadow.pipit`

,`pied.wagtail`

,`robin`

,`tree.pipit`

,`wren`

- id
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 (1931) gives summary details of the data.

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
```

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