Lesson #1a - Calibrating Alexa

[This is a follow-up to Lesson #1 - Using Alexa]The question was asked, "If you know that a web site has a rank of 1,000 on Alexa, what does that mean in terms of real traffic? How many visitors a month is that?"The way you figure that out is by calibrating alexa. Many sites will publish or announce their "unique monthly visitors", and by finding several announcements like that you can determine,