What tge sampling technique on GA?
I've met notice of sample data from Custom Report GA. But I never know What the sampling technique that use on there? And what the measure that estimated? Total number or average/mean?
Re: What tge sampling technique on GA?
Custom Reports typically do not use data sampling. Which essentially means they take a percentage of the data instead of ALL of your data you are trying to call.
More on data sampling here: https://support.google.com/analytics/answer/2637192?hl=en
Data sampling can happen in custom reports when you're querying high volume of data (Google does not specify what counts a high volume of data for Custom Reports).
If your Custom Report says "This report is based on [number]% of sessions." then the percentage shown is the percentage of the total data that is relevant to your report being displayed.
So if it says "This report is based on 50% of sessions." it means it has pulled only 50% of your sessions because of the large amount of data.
You can increase this percentage by clicking on the box above and moving the button to a higher precision - although this will not give you all 100% of your data.
To avoid this try querying a shorter time period.
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