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Hello all,
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.
Thank you!
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Hello,
What SAS version do you use?
Submit
%PUT &=sysvlong;
to find out!
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.
See here :
SAS/ETS 15.2 User's Guide
Forecasting Process Details
Predictor Series --> Intervention Effects
https://go.documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/etsug/etsug_tffordet_sect040.htm
Also, go to
https://www.lexjansen.com/
and enter these search terms :
interrupted time series analysis
BR,
Koen