Dear Listers, I would be interested in representing a trend surface including an interaction term z = f(x,y,x.y) - eg the type of chart obtained with persp() or wireframe(), then adding datapoints as a cloud, ideally with dots which are under the surface in a color, and those who are above in another color. An other option would be to draw segments between the dots and the ground of the chart.
scatterplot3d looks like being close to do such things except it does not to include (to my knowledge) a coefficient for the interaction term (thus just model z = f(x,y). Does anybody has an idea where to start with this and the main steps? Or a place/website where some script examples can be found? Patrick ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
