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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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Difference in Data Among GA Standard Reporting, Custom Reports and GA Dev Tool Explorer

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# 1
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I have extracted number of pageviews for goal starting page and goal completion page. But the data given by GA Reporting under Funnel Visualization is different then I data get from Custom Report and through GA Dev Tool. 


Lets say it by example: 

Funnnel Visualisation: Goal Start: 500, Goal Complete: 150


Custom Report: Goal Start: 470, Goal Complete: 145

GA Dev Tool: Goal Start: 470, Goal Complete: 145


The data extracted from custom report and GA Tool is mainly same but that differs with actual Funnel Visualisation. 


I've also tried with all 3 sampling level in GA Dev Tool, but still give same data for all sampling levels. 


And what is the best way to get the actual and exact data? Why data differs with each other? 


Looking forward for some help.