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Back in January, +SEOmoz did a test of these free statistics services and came to the conclusion that the visitor data provided did not match their own analytics.

Does that mean all of the data provided by these sites are rubbish? Not necessarily... Here's a detailed analysis by +KISSmetrics #AnalyticsTools
We have relied on these tools for competitor research for ages, so we thought we would go beyond just the visitor data and look at other key pieces of information to see if they match up with Google A...
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