How do you find the demographic statistics like - %age group

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How do you find the demographic statistics like - %age group, and then how you determine to target market related to your niche? I want to know the entire process. While were doing the skillado project, you send us a document with demographics stats. So I just want to know how you do it?

[SlavaRybalka]

Quantcast

Compete

take your competitors website's and run them through the services metioned above

also: Yahoo Pulse, Google Trends