Microtus classification (more vole data)

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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

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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) dQuoteDiscrimination 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

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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)