First round was a 20 question survey that was a mixture of scientific "facts" (that they allow you to google during the test) and statistical concepts. Second round was a long take home exam that they emailed me late at night on the weekend. Then rejected me because they felt I didn't have a strong enough understanding of some concepts in answers. I respect their desire to get a profile of candidate strengths and weaknesses, but I think they should write on their website the nature of their evaluation process. It felt a little like they were trying to "gotcha" question me so they could reject me. It would help if HR personally and professionally explain the process to job candidates.