Brian, I'd be happy to post an explanation of bias and the forms it can take but you'll have to give me a couple of days. Between family coming for Thanksgiving and sleeping a lot during the end of my breast cancer rad the past couple of weeks, I'm way behind on grading for my online class. Writing something about bias sounds like a lot more fun, quite honestly, but also something I'd want to spend some time on wording well, and duty calls first.