Someone asked me about the distinction between bias and noise and I sent him some links. Then I thought this might interest some of you too, so here it is: Here’s a recent paper on election polling where we try to be explicit about what is bias and what is variance: And here are some other things I’ve written on the topic: – The bias-variance tradeoff – Everyone’s trading bias for variance at some point, it’s just done at different places in the analyses – There’s No Such Thing As Unbiased Estimation.