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Hi Phil,

Perhaps we are talking about the same thing - how do you restrict voting to
unique users?
What I say is that if you do it by requiring to register into an account,
ask few "background" question during registration. 

It will enable, in the future, to group survey results by the categories of
answers (e.g.: male/female, personal use/business use, student/small

And just to clarify, the problem with sampling bias as I described it can
not be ameliorated simply by a large sample size. Large sample size work for
a random sampling process. What I'm concerned about is a consistent bias in
the sampling process. In this case increasing the sample size can only make
things worse. 
But indeed, this is way ahead of us...


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