I would like to ask the same question about transreg: how do I get the predicted value Y instead of predicted transformed Y?
The example below shows a mspline transformation on Y. SAS will show the predicted transformed Y, denoted as PY. How do I get predicted Y based on PY?
data x;
do i = 1 to 5000;
w = normal(7);
x = normal(7);
z = normal(7);
y = w * w + log(5 + x) + sin(z) + normal(7);
output;
end;
run;

proc transreg data=x solve details ss2;
ods output splinecoef=c;
model mspline(y /nknots=9) = spline(w x z / knots=-1.5 to 1.5 by 0.5
exknots=-5 5);
output out=d predicted;
run;