I fixed it by adding 0.0001 to my binwidth. so my code went from proc sgpanel data = subjectlevel; panelby class; histogram score/ binwidth = 2.5 binstart = 1.25; colaxis values = (0 to 50 by 5); run; to proc sgpanel data = subjectlevel;
panelby class;
histogram score/ binwidth = 2.5001 binstart = 1.25;
colaxis values = (0 to 50 by 5);
run; ...
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