I don't know if your PhD automatically qualifies you as a good experimental
scientists. Last I heard was that 95% of studies published in scientific peer
reviewed journals were bad to uninterpretable.

You probably meant to say that bias is a large and vast concept and "bias of
ascertainment" is a specific type of bias.

Instead of using the $0.50 phrase "bias of ascertainment", how about a $0.05
rendition of what you think it means so any dumb hick like me knows what your
talking about.

But if it's what I suspect then it's a simple enough issue to deal with and has
been dealt with in many ways for decades. Surveys and marketing research aren't
recent inventions. They can get the goods on what populations will generalize
to the target audience for the browsers release. 



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