Analytics
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Understand information in your reports and troubleshoot reporting issues such as self-referrals, (not set) data, and inaccurate information
 
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Strange trend appears when segmenting data by device

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No significant, sharp traffic decreases/increases here:

Overview_-_Analytics.png

But when I segment this by device type to see the different between desktop & mobile/tablet, the data shows a very strange difference between pre-November data and post-November data. This trend is not found within the

Overview_-_Analytics.png

 

It appears to be related to an issue in sampling because the sample rate shifts from 100% to 0.73% over the same period of time, but when I run this on other sites with even larger volume, this sort of issue does not occur.