Important to note their findings only apply to a smaller subset of people, and do not include those with the most need.
> The findings of the pilot project will be generalizable not to the entire German population, but to 21- to 40-year-old individuals in single-person households with middle incomes.
The reason:
> We were thus faced with the decision of selecting 122 people who represented the entire country but did not provide scientifically reliable data on the effects of a basic income, or selecting 122 people from a more limited group from whom we could draw definitive conclusions. In the end, we chose the latter.
> The findings of the pilot project will be generalizable not to the entire German population, but to 21- to 40-year-old individuals in single-person households with middle incomes.
The reason:
> We were thus faced with the decision of selecting 122 people who represented the entire country but did not provide scientifically reliable data on the effects of a basic income, or selecting 122 people from a more limited group from whom we could draw definitive conclusions. In the end, we chose the latter.
https://www.pilotprojekt-grundeinkommen.de/en/blog/how-the-p...