In reply to Michael David Lewin.

There is not a problem to be fixed. PROC SGPLOT plots the data that you give it. The issue is that in this case you are looking for a slice through the regression function rather than a projection onto a coordinate subplane. You can use the EFFECTPLOT statement, or you can use the DATA step and the SCORE statement to create the slice yourself. As to customizing the output of the EFFECTPLOT statement, yes, you can do it. My favorite way is to use the ODS OUTPUT statement get the data that underlies the effect plot, then recreate the plot by using PROC SGPLOT.