I would like to compute R-squared change for the interaction/moderation term in a multiple regression model, along with the corresponding F- and p-values. Previously, I have worked with the modprobe macro by A. Hayes, which can produce this for SPSS. As I am transitioning to R now, I am trying to find a function/package or a custom-made script in R that does this. In case it helps, my current interaction model looks like this:
m1 <- lm(all_ART~Neuroticism*Agreeableness+Attentional.Control, data=stp2_sub2, na.action=na.omit)
Any pointers on how to compute these values (i.e., $R^2$(interaction), F-value(interaction) and p-value(interaction)) for the interaction term in R would be much appreciated!