Hi all! I have a problem with ggplot2, in particular i don't succeed in plotting predictions from an ordinal regression model (fitted with polr function in MASS package). Can someone help me plotting them by Rating?
I want to plot in one graph (one graph for each category) the fitted probabilities at each level of the rating.
Thaks who will help me!!!
PS: My name is Marco, and i'm 22. I am attending Master's degree in Statistics for Decision Making.