Plotting longitudinal series
Description
Aim: Adjust the graphical parameters to create nicer
longitudinal series plots. The default set of graphical parameters is very
general, and can be improved upon when we are interested in plotting data
points observed over time. Functions facilitate plotting those kind of
series, univariate plots, bivariate plots (with vertical axis on both left
and right hand sides), multivariate plots and plots which allow to examine
whether a new observation is 'unusual' via construction and visualization
of prediction intervals around it.