rats {shapes}

Rat skulls data

Description

Rat skulls data, from X rays. 8 landmarks in 2 dimensions, 18 individuals observed at 7, 14, 21, 30, 40, 60, 90, 150 days.

Usage

data(rats)

Format

rats$x: An array of landmark configurations 144 x 2 x 2

rats$no: Individual rat number (note rats 3, 13, 20 missing due to incomplete data)

rats$time observed time in days

Source

Vilmann's rat data set (Bookstein, 1991, Morphometric Tools for Landmark Data: Geometry and Biology, pp. 408-414)

References

Bookstein, F.L. (1991). Morphometric tools for landmark data: geometry and biology, Cambridge University Press.

Examples

data(rats)
plotshapes(rats$x,col=1:8)