ex1027: Factors Affecting Extinction

In Sleuth3: Data Sets from Ramsey and Schafer's "Statistical Sleuth (3rd Ed)"

Description

Data are measurements on breeding pairs of land-bird species collected from 16 islands around Britain over the course of several decades. For each species, the data set contains an average time of extinction on those islands where it appeared, the average number of nesting pairs, the size of the species and the migratory status of the species.

Usage

ex1027

Format

A data frame with 62 observations on the following 5 variables.

Species

a character vector indicating the species

Time

average extinction time in years

Pairs

average number of nesting pairs

Size

a factor with levels "L" and "S"

Status

a factor with levels "M" and "R"

Source

Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.

References

Pimm, S.L., Jones, H.L., and Diamond, J. (1988). On the Risk of Extinction, American Naturalist 132(6): 757–785.

Examples

str(ex1027)

Example output

'data.frame':	62 obs. of  5 variables:
 $ Species: Factor w/ 62 levels "Blackbird","Blue_tit",..: 48 3 21 29 17 33 35 30 55 8 ...
 $ Time   : num  3.03 5.46 4.1 1.68 8.85 ...
 $ Pairs  : num  1 2 1.21 1.13 5.17 1 2.75 5.63 3 4.67 ...
 $ Size   : Factor w/ 2 levels "L","S": 1 1 1 1 1 1 1 1 1 1 ...
 $ Status : Factor w/ 2 levels "M","R": 2 2 2 2 2 1 2 2 2 1 ...

Sleuth3 documentation built on May 2, 2019, 6:41 a.m.