Excellent article!
Add to that the inherent sampling errors problem and the conclusion of the article
Quote:
This clearly shows that the Alexa rankings have no statistical validity.
There are also more factors which further decrease the accuracy of these statistics, such as the fact that only relatively advanced internet users ("techie types") are likely to install the toolbar in the first place.
Summary
The Alexa website traffic monitoring system is so inaccurate as to be worse than useless - it is very misleading. Perhaps most concerning is that it is trivially easy for website owners to manipulate their own rankings. We recommend that you do not take Alexa seriously.
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is hard to dispute.