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I opened Google Analytics website->Demographics->Overview and got following data of my android app: enter image description here

There is a line at top right corner

71.12% of Total sessions

What does above line means to the data?

What about the remaining 28.88%?

2 Answers 2

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It's sampling. Google Analytics analyzes a sample set of data to extrapolate an estimate of 100% for certain non-default reports. This is common with most analytics tools as it saves huge amounts of space / CPU.

The thresholds for Google Analytics are thus:

Default reports are not subject to sampling.

Ad-hoc queries of your data are subject to the following general thresholds for sampling:

  • Analytics Standard: 500k sessions at the property level for the date range you are using
  • Analytics 360: 100M sessions at the view level for the date range you are using

https://support.google.com/analytics/answer/2637192?hl=en

It is possible to get un-sampled data using the API but for most purposes, sampled data will still allow you to make actionable marketing decisions.

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It means Google was able to identify the age of the visitor during 71.12% of your site visits

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  • I'm pretty sure that's not correct. Do you have any references to verify that? Commented Jan 14, 2018 at 10:51
  • check this link support.google.com/analytics/answer/2799357?hl=en#where Also you can test these %'s by creating respective demographics based segments such as these: prnt.sc/i0u1qy prnt.sc/i0u3e4 Apply these segments on the overview report and compare the %s.
    – Aiyanna K
    Commented Jan 15, 2018 at 18:14

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