tortues {ade4} | R Documentation

## Morphological Study of the Painted Turtle

### Description

This data set gives a morphological description (4 characters) of 48 turtles.

### Usage

    data(tortues)

### Format

a data frame with 48 rows and 4 columns (length (mm), maximum width(mm), height (mm), gender).

### Source

Jolicoeur, P. and Mosimann, J. E. (1960) Size and shape variation in the painted turtle. A principal component analysis. Growth, 24, 339–354.

### Examples

    data(tortues)
    xyz <- as.matrix(tortues[,1:3])
    ref <- -svd(xyz)$u[,1]
    pch0 <- c(1,20)[as.numeric(tortues$sex)]
    plot(ref, xyz[,1], ylim = c(40,180), pch = pch0)
    abline(lm(xyz[,1]~ -1 + ref))
    points(ref,xyz[,2], pch = pch0)
    abline(lm(xyz[,2]~ -1 + ref))
    points(ref,xyz[,3], pch = pch0)
    abline(lm(xyz[,3]~ -1 + ref))

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