Almost all data is hierarchical. Only multilevel design properly account for this. Don’t generalize to what you didn’t sample from.
Don’t take my word for it, but being a scientist is about being a skeptic. About not being satisfied with easy answers to hard problems. About not believing something merely because it seems plausible… .. nor about reading a scientific study and believing its conclusions because, again, it seems plausible. “In some of my darker … Read more