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Event Tracking Accuracy_large date range didn't capture some event labels from small date range

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# 1
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I'm using Customized Report to pull out # of Total Events. But when I select two different data range, my large date range didn't capture every event label in small date range. See screenshot below, the two highlighted event labels were not captured in the larger date range, even though I used exact same Regex filter, just changes the date range. Anyone has the same accuracy issue before? Thanks, 

 

-2015-today      ---large date range    

-2016-today     ---small date range     

 

large.JPGsmall.JPG

 

 

 

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Event Tracking Accuracy_large date range didn't capture some event labels from small date range

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# 2
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In addition, I don't know why 1+1 equals to 3 in my first screenshot's Total Events column...

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Accepted by topic author Stella Z
May 2017

Event Tracking Accuracy_large date range didn't capture some event labels from small date range

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# 3
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Hi Stella,

 

You are probable seeing sampling on the larger date range.  Sampling happens anytime you query more than 500k sessions ( for most reports) that have not been per-aggregated.  Examples are custom reports, custom segments and secondary dimensions. 

 

Sampling is user based so you'll get different results that can sometime be significant.

 

Hope that helps.

 

Best,

 

Theo Bennett

Analytics Evangelist at MoreVisibility | Contact Me
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Event Tracking Accuracy_large date range didn't capture some event labels from small date range

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# 4
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Thanks Theo! I think you sent me to the right direction! Indeed, the larger date only represents 60% of whole sample. 

Event Tracking Accuracy_large date range didn't capture some event labels from small date range

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# 5
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You are most welcome!  Have a great day!

 

-Theo

Analytics Evangelist at MoreVisibility | Contact Me
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