Does anyone have examples of how to perform a ramp function using SAS for an interrupted time series analysis? The assumption I have is that the change isn't going to occur instantaneously and that I need to account for multiple points in time (in this case months) to see a change but want to be able to analytically look at change over those time periods in between guideline introduction and behaviour change.
Do you want to perform this analysis code-free or can you do PROC ARIMA (PROC CARIMA for CAS)? ARIMA methodology is just an example. Other methodologies are possible for investigating ramp interventions.
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