#StackBounty: #google-analytics Vast discrepancy in distribution when I add segments to Google Analytics data

Bounty: 50

I am using Google Analytics for a multilingual website. I recently started digging deep into the pageview data and found something really peculiar. My pageview data as well as unique visitors have been fairly stable for the last two years, at least this is what I have thought. For ALL different filters and ways of analyzing my pageviews I get this data, and this distribution of pageviews for the last 2 years. Sorry about the Swedish words but you only need to see the distribution and numbers.

Common view of my pageview data

However, when I click “Add segment” and, for example, add “Mobile” to the data I get this distribution:

Distribution when I add a segment

As you can see below the graphs, the total number of pageviews and other data are pretty much the same, but not exactly the same (which in a way is interesting) but the distribution is quite different when we look at blue area here, which is “All segments”. It should be the same as the top one, as I have only added a subset to the graph.

This paints a different picture of how the website is actually doing (i.e. a whole lot worse this year than last year). I have seen a decrease in ad income which could imply that the latter is more relevant but it is not a very good measurement.

Another interesting thing is that I use exactly the same setup for other translations of the website (but with different Google Analytics ID:s) and I do not see any discrepancies there.

Why is there a discrepancy between the two graphs, just because I add “Mobile” to it? Most importantly, which is the most relevant one?

Get this bounty!!!

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