proc glm data=work.data_1;
class z;
model y=w z;
run;
Appreciate if anyone could let me know how to add to the plot horizontal lines correspondent means for y in each group z.
I don't think such a facility is available in GLM. I think you have to pre calculate the mean values for each group and use the REFLINE Statement in PROC SGPLOT.
Save it as a dataset by :
ods output ANCOVAPlot=want;
proc glm data=sashelp.class;
class sex;
model weight =sex height;
quit;
and plot refline via PROC SGPLOT .
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