It’s a reasonable question, and the reply to your OP suggests it was accounted for but I don’t know enough about stats to say that it fully accounts for it. I w

It’s a reasonable question, and the reply to your OP suggests it was accounted for but I don’t know enough about stats to say that it fully accounts for it. I would say it’s still very reasonable to be skeptical and ask if it is still biased, or still partially biased.