To look at treatment effect persistence, we exploit data points at follow-up in an extended
sample. As all respondents have been treated at follow-up, we cannot estimate causal effects,
so that results are exploratory.
Thanks—I missed that on my skim. But the “extended” follow-up is only for another two months. It does seem to indicate that effects persist for at least that period, without any trend towards baseline, which is promising (though without a control group the counterfactual is impossible to establish with confidence). I wonder why they didn’t continue to collect data beyond this period.
Thanks for your thoughts!
Yes, regarding persistence they also note:
Thanks—I missed that on my skim. But the “extended” follow-up is only for another two months. It does seem to indicate that effects persist for at least that period, without any trend towards baseline, which is promising (though without a control group the counterfactual is impossible to establish with confidence). I wonder why they didn’t continue to collect data beyond this period.