hcc (version 0.54)

gala: Species diversity on the Galapagos Islands

Description

There are 30 Galapagos islands and 7 variables in the dataset. The relationship between the number of plant species and several geographic variables is of interest. The original dataset contained several missing values which have been filled for convenience.

Usage

data(gala)

Format

A data frame with 30 observations on the following 7 variables.

Species

the number of plant species found on the island

Endemics

the number of endemic species

Area

the area of the island (km^2)

Elevation

the highest elevation of the island (m)

Nearest

the distance from the nearest island (km)

Scruz

the distance from Santa Cruz island (km)

Adjacent

the area of the adjacent island (square km)

Source

M. P. Johnson and P. H. Raven (1973) "Species number and endemism: The Galapagos Archipelago revisited" Science, 179, 893-895

References

J. J. Faraway. Linear Models with R. Chapman & Hall/CRC, 2005 and J. J.Faraway. Extending the linear model with R. Chapman & Hall/CRC Taylor & Francis Group, 2006.

Examples

data(gala)
gala <- gala[,-2]
modt <- lm(sqrt(Species) ~ . , gala)
res <- resid(modt)
hctest(gala[,3], residuals(modt))