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As you can see the trends for both statistics packages are the same. On average Google Analytics Visits number is only 58% of the values that Nettracker reports as visits.
It doesn't matter which one is correct as long as the trends are similar!
This blog analyzes the rise and fall of Google. The people at Google do amazing things. How long will Google fly high? The blog will also cover issues related to online marketing and conversion rates. The blog is NOT part of Google.