ex1220: Galapagos Islands

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

Description

The number of species on an island is known to be related to the island's area. Of interest is what other variables are also related to the number of species, after island area is accounted for, and whether the answer differs for native and non native species.

Usage

ex1220

Format

A data frame with 30 observations on the following 8 variables.

Island

a character vector indicating the island

Total

total number of observed species

Native

number of native species

Area

area (km^2)

Elev

elevation (m)

DistNear

distance from nearest island (km)

DistSc

distance from Santa Cruz (km)

AreaNear

area of nearest island (km^2)

Source

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

References

Johnson, M.P. and Raven, P.H. (1973). Species Number and Endemism: The Galapagos Archipelago Revisited, Science 179(4076): 893–895.

Examples

str(ex1220)

Example output

'data.frame':	30 obs. of  8 variables:
 $ Island  : Factor w/ 30 levels "Baltra","Bartolome",..: 1 2 3 4 5 6 7 8 9 10 ...
 $ Total   : int  58 31 3 25 2 18 24 10 8 2 ...
 $ Native  : int  23 21 3 9 1 11 12 7 4 2 ...
 $ Area    : num  25.09 1.24 0.21 0.1 1.05 ...
 $ Elev    : int  332 109 114 46 130 119 93 168 46 112 ...
 $ DistNear: num  0.6 0.6 2.8 1.9 1.9 8 6 34.1 0.4 2.6 ...
 $ DistSc  : num  0.6 26.3 58.7 47.4 1.9 ...
 $ AreaNear: num  1.84 572.33 0.78 0.18 903.82 ...

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