microtus {Flury}R Documentation

Microtus classification (more vole data)

Description

Microtus multiplex and M. subterraneus are difficult to distinguish morphologically. Here we have 43 known multiplex, 46 known subterraneus and a further 199 unidentified species.

Usage

data(microtus)

Format

A data frame with 288 observations with a factor indicating the species and observations on a further 8 variables.

Group
a factor with levels multiplex subterraneus unknown
M1Left
Width of upper left molar 1 (0.001mm)
M2Left
Width of upper left molar 2 (0.001mm)
M3Left
Width of upper left molar 3 (0.001mm)
Foramen
Length of incisive foramen (0.001mm)
Pbone
Length of palatal bone (0.001mm)
Length
Condylo incisive length or skull length (0.01mm)
Height
Skull height above bullae (0.01mm)
Rostrum
Skull width across rostrum (0.01mm)

Details

89 species have been identified by means of chromosomal analysis.

Source

Airoldi, J.-P., B. Flury, M. Salvioni (1996) dQuote{Discrimination between two species of Microtus using both classified and unclassified observations} Journal of Theoretical Biology 177:247-262

References

Flury, B.D. (1997) A First Course in Multivariate Statistics, New York: Springer

Examples

data(microtus)
## Not run: 
pairs(microtus[,-1],
    lower.panel = function(x, y){ points(x, y,
    pch = unclass(microtus[,1]),
    col = as.numeric(microtus[,1]))},
    main = "Pairwise scatter plots for Microtus data")
## End(Not run)


[Package Flury version 0.1-2 Index]