My question to you is quite short and I am only asking for help in using the ‘rms’ package to draw the third plot of the response variable predictions for the LOCATION*MATRIX interaction effect (i.e. I need an additional plot with two variable factors as I may show you in the bottom of this letter) in the example given by Dr. Charles Holbert:
based on a brilliant idea of the Proportional Odds Ordinal Logistic Regression.
I confess that I’ve spent many hours alone and I can’t complete this drawing. Then if you think that my question makes sense, then I kindly ask you to help me to write an appropriate R code solution. Of course, in a planned paper situation, your input will be quoted.
I think this additional plot would complement a lot in terms of the graphical presentation of these predictions and I will be so obliged for your help.
With words of respect, Andrzej Tukiendorf.