3K members online now
Understand information in your reports and troubleshoot reporting issues such as self-referrals, (not set) data, and inaccurate information
Guide Me

HUGE discrepancies in numbers when segments are added

Visitor ✭ ✭ ✭
# 1
Visitor ✭ ✭ ✭

Running a report of Sessions / Users / Pageviews for January 1 - August 31, 2016 and comparing with the same time frame for 2015.


I'm having an issue, when I turn on my "External Traffic only" filter my All Users pageviews jump from 2.8 million to 3.2 million (external traffic only = 2.2 million). How the number GROWS makes absolutely 0 sense to me - this is all before I turn on the comparison. 


THEN when I compare to 2015 my All Users pageviews (for 2016) jump to 3.9 million (external traffic only = 2.2 million).


Any insight would be much appreciated.

1 Expert replyverified_user

Re: HUGE discrepancies in numbers when segments are added

Top Contributor
# 2
Top Contributor

What you're seeing is caused by data sampling. Sampling kicks in If the number of sessions in the property over the given date range exceeds 500k. Please check the links below for more information about sampling:

Hope this explains the discrepancies you are experiencing.

Arnold Majlath, Google Analytics Top Contributor
Was my response helpful? If yes, please accept it as solution.
Circle Me On Google+ | Visit me @ Redfly Digital