Over at Pollster.com, Doug Rivers has a long post about survey bias and weighting.
http://www.pollster.com/blogs/doug_rivers.php
We're not talking about standard internet junk polls here, but ones that are actually trying to measure something. This is an increasing problem in the industry: people are much less willing to be surveyed, and the ones who are willing may not be the same as those who are not.
It's a great post if you are interested in this sort of thing, and there have to be at least a dozen people besides me who are. I think Rivers pays too much attention to matching demographics (and not enough to matching behavior), but then that's what he had to work with.
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