Google Analytics Session Definition Changed

Monday, September 19th, 2011 | Business | by

This got past me last month, and wanted to make sure all my “loyal” (hah, no offense but most of you are from India just looking for a fix to something) readers saw this.

As of August 11, 2011 Google changed the way Sessions are defined.

The old model ended a session when one of the following occurred:

  • More than 30 minutes between pageviews
  • At the end of a day (local time midnight)
  • When a visitor closes their browser

In the newer version, Google ends a session when:

  • More than 30 minutes between pageviews (same)
  • At the end of a day (local time midnight, same)
  • When any traffic source value for the user changes. ┬áThis includes: utm_source, utm_medium, utm_term, utm_content, utm_id, utm_campaign, and gclid.

So.. for me this has meant a drop of 36 visits out of about 3000 visits (negligible when you assume minor fluctuations in “quality” of content). ┬áThis is in line with Google’s statement that it will change your visitors by about 1%.

 

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