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Google Analytics Vs. Webtrends Log Info - Discrepancy
Posted 28 January 2010 - 11:13 AM
We use both Web Trends (logs only, no JS or cookies) and Google Analytics (JS). And we're seeing a different of nearly 50% in the count of visits in a given month.
Here are some of my thoughts - I'd love to hear yours because I am going crazy trying to find the answer:
1. We didn't have the GA tag placed on all pages - bad boys over there in IT, but this only accounted for maybe 3-5% of the "missing" visits in GA.
2. GA excludes all crawlers, bots, etc. WT only excludes those on the "list". There is the list of the top 100 visitors and many of these are crawlers, bots, etc. But that still doesn't explain the 50% difference, unless there are a gazillion crawlers hitting our site for 1 or 2 visits that are outside of the top 100. Possible, but is is adding up to more than a 1 million visit difference? I dunno....
3. The GA script is the bottom of the page - possible issues with single page visitors (nearly 1.9 million last month) leaving before the tag is activated?
What am I missing ladies and gents?
Thanks in advance for all of your help!
Posted 28 January 2010 - 12:15 PM
Posted 28 January 2010 - 12:24 PM
Posted 28 January 2010 - 12:38 PM
As Jill already said you've hit on all of the major ones I'd be looking at when you're talking about a difference between a log analyzer and an external .js analyzer. Sad to say perhaps, but no two are ever going to give you the same numbers. And often the counts will be wildly different.
That's why I tend to stick with comparing numbers within the same tool. Yes I have a log analyzer built into my sites. And yes I have GoAn on most of them. And yes I do look at both. I just never compare one to the other, expect in a rather loose manner when I see the traffic numbers go up significantly in one and want to confirm a similar rise in the other.
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