These are rather simple data, involving the movement of the lower lip
while saying "bob". There are 20 replications and 51 sampling points.
The data are used to illustrate two techniques: landmark registration
and principal differental analysis.
Principal differential analysis estimates a linear differential equation
that can be used to describe not only the observed curves, but also a
certain number of their derivatives.
For a rather more elaborate example of principal differential analysis,
see the handwriting data.
See the lip
demo
.