Effectplot question

[jgreenberg321]

Hello,

I am interested in plotting the predicted probabilities from an interaction I've created using proc genmod. I would like to have the x-axis be a categorical variable by year, so the probabilities are displayed as strait lines between years. I set year as a categorical variable in my model with 2011 (earliest year) as the reference. However, when I create the effect plot, the years are displaying out of order. Does anyone know if there is an easy way to set the ordering/levels of the categorical variable on the x-axis. For reference, example code is below. Thank you!

proc plm source=genmod;

effectplot interaction (x=year sliceby=group ) ;

run;

[StatDave]

Try explicitly setting the order for the YEAR variable in your CLASS statement so that its levels are ordered by its internal levels. For example:

proc genmod;
class group year(order=internal);
model y=group year;
effectplot interaction(x=year sliceby=group);
run;