I am trying to make a contour plot in R with two categorical variables and a response variable. I can see a lot of examples with the numeric dataset, but I am having trouble making a contour plot/response surface curve. Any help will be highly appreciated. I am attaching my data in this link: https://drive.google.com/file/d/10N-P5o7SwL9VYfQjxTkYCMoEcEIMWHP-/view?usp=sharing
Thank you.
I have tried scatterplot2d, contour plot, and some other links available over internet. I am expecting a response surface curve.
