Morphological Study of the Painted Turtle
This data set gives a morphological description (4 characters) of 48 turtles.
data(tortues)
a data frame with 48 rows and 4 columns (length (mm), maximum width(mm), height (mm), gender).
Jolicoeur, P. and Mosimann, J. E. (1960) Size and shape variation in the painted turtle. A principal component analysis. Growth, 24, 339–354.
data(tortues) xyz <- as.matrix(tortues[, 1:3]) ref <- -svd(xyz)$u[, 1] pch0 <- c(1, 20)[as.numeric(tortues$sexe)] 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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