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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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Why is there such a big difference in sample rates year on year

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# 1
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I'm seeing single figure sample rates for date ranges of a month in 2015 but when I look at the same range in 2014 the sample rates are usually more than double. Why? 

Also, in the same vein, If I use the 'compare to: previous year' feature an increase year on year viewed in separate tabs becomes a significant decrease. How is that right? 

1 Expert replyverified_user

Re: Why is there such a big difference in sample rates year on year

Top Contributor
# 2
Top Contributor
Hi Nick,

sampling in Analytics occurs if the number of sessions in a report exceeds about 500.000 [1] - so, most probably, your number of visits in 2015 has doubled compared to 2014.

Christoph

[1] https://support.google.com/analytics/answer/1042498?hl=en

Re: Why is there such a big difference in sample rates year on year

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# 3
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Not doubled, but they are up around 20% year on year.