Hello @LNA2021 ,
I have moved your question to the
SAS Forecasting and Econometrics board (under the Analytics header).
You will get much better answers here.
Note there's a lot of literature on this subject. And many approaches are taken : ARIMA(X) , State Space Models (SSM), Mixed models , ...
But to re-assure you : PROC ARIMA can definitely be used for interrupted time series analysis.
Cheers,
Koen
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