The categoric contour plot is a two-dimensional (2D) representation of the response plotted against combinations of categoric factors. The plot cannot show both numeric and categoric factors at the same time. Use an interaction graph, with the numeric factor on the X1 axis, to view a categoric - numeric combination.
There are no contours on this plot.
The predicted values at the intersections of factor levels are displayed.
Use the 3D Categoric Surface “City-Scape” plot to view a categoric model as a response surface.
For a more general set of graph tools see Model Graphs - General Information