A web sites ranking service. It ranks sites based on tracking information of users of its Alexa Toolbar.

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What causes a website's alexa page-rank and traffic data to display highly regular sine wave patterns over a period of 30 days?

At first I wondered if it was due to the traffic difference between day and night, but that turned out not to be the case, since the period of rise and drop in traffic was about a week, not overnight. ...
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how is sites such as alexa.com monitor all web wide sites traffic in the internet ? [duplicate]

Possible Duplicate: alexa and compete Hello, i'm trying to understand idea of traffic monitoring sites such as alexa.com , which can monitor traffic for any site in the internet (although ...
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Is there a (free) reliable place to get statistics from sites, more reliable than Alexa, Quantcast, Compete? [closed]

I mean, seems there's no way. I am just asking in case someone knows of a recent new site being more accurate. I am aware of Alexa's, Compete and Quantcast inaccuracies and/or limited system/range of ...