Richard M. Heiberger and Burt Holland
Trellis Extensions
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We have designed several multi-panel graphical displays for which the
panels are defined by the Cartesian product of one set of variables or
parameters with another set. The traditional scatterplot matrix splom
is the special case where both the row and column sets of variables are
the same and the panels are ordinary scatterplots. Our displays extend
the interpretation of the model formula to allow the panels to be
functions of parametric transformations of the variables in the formula.
We show examples of scatterplot matrices with different sets of variables
along the rows and columns, of a ladder of powers display, of interaction
plots, of ANCOVA plots, of Least Squares plots, and of Time Series plots.