Ramp function ITS

[mmaximos]

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!

[sbxkoenk]

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