Thanks for the comment. By saying "I get good signal" I mean that it's not a binary yes/no, but gives a range to score the candidate. You are right about actual

Thanks for the comment. By saying "I get good signal" I mean that it's not a binary yes/no, but gives a range to score the candidate. You are right about actual correlation to job performance. I know the HR at Google performed correlation analysis between interview scores and job performance and made internal observations, which as you note is biased because only includes hired candidates.