Hi can try this hope it will solve the question
data groups(rename=(y2=y));
set cert.input48;
if upcase(cvar) in ('A','B','C','D','E','F','G') then group=1;
else if upcase(cvar) in ('H','I','J','K','L','M','N') then group=2;
else group=3;
y2 = input(y,best.);
drop y;
run;
proc means data=groups mean maxdec=2 noprint;
class group;
var x y;
output out=progy48(drop=_type_ _freq_) mean=m_x mean=m_y;
run;
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