proc sgplot data=import;
reg x=date y=y_variable/group=intervention;
run; Above is the code I'm using, and the goal is to show that after the intervention was implemented, there was a slope change. Essentially, the code above gave me two separate slopes: a pre intervention and a post-intervention slope, which is great. I want to connect the end of my pre-intervention slope to the start of my post-intervention slope. Is there another code that I can use for this? The other thing I tried doing was to use proc autoreg to generate values for "ytrend" or the "predicted trend" according to the SAS support guide on proc autoreg. When I plotted that against the date, it was able to connect the separate lines the way I want it. However, the "ytrend" lines don't fit the data points/scatter points as well as the regression lines described earlier. My question is, in time series analysis, is the "ytrend" line the same as the "regression line" - are they analogous? I would really appreciate your expert advice as I am clearly very new to SAS graphics.
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