Hi @Pau_lina ,
There's a few areas you can explore for, just a quick question: Are you aiming for a crossing time/target that you are trying to understand when the abstinence crosses?
1. The Repeated and Destructive Degradation modules in the Reliability and Survival > Degradation module, you can put your covariates in the 'X' position. More links here.
2. Fit Curve (and Fit Curve DOE) can be used to apply pre-made models (even if they aren't DOE's) to look at the effect of your covariates.
3. The non-linear platform is more involved, as it requires you to write out a parameterized formula that you believe your system obeys (this can be pre-made in the NL platform too).
Hope that helps, let me know if you've got questions on the specifics.
Thanks,
Ben
“All models are wrong, but some are useful”