Hello! I am trying to run an interrupted time series analysis on admissions data from four clinics. The dependent variable is the total count of all visits (aggregated across the four clinics) and the independent variables are week, interruption, and the interaction variable. The dependent variable appears to be normally distributed, so I have been using proc autoreg in order to account for autocorrelation since it is time series data. However, my advisor suggested that I also need to account for the clustering of the data (since it comes from four separate clinics). I am not sure how or what procedure is available to account for both autocorrelation and clustering? Any advice would be greatly appreciated.
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