Approx Count Distinct vs Unique Vsitor | Community
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Luca_Lattarini
Luca_Lattarini
Level 9
Jul 20, 2020 2:41 AM UTC
Solved

Approx Count Distinct vs Unique Vsitor

Hello everyone,

 

I am comparing Approx count Distinct Visitor that is calculate on Customer ID with Unique Visitor. When I compare these two values I expect a Unique Visitor > Approx count Distinct but in some cases, it is smaller. Any suggestion?

Thanks

 
 
 

 

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isinhaAccepted solution
Employee
Jul 20, 2020 11:05 AM UTC

Hi @luca_lattarini ,

Are the number of customer ID crossing the uniques exceeded limit? In that case, it will be counted as 1 item. Also, please note that the function uses the HyperLogLog (HLL) method of approximating distinct counts.  It is configured to guarantee the value is within 5% of the actual value 95% of the time. So, it's not 100% accurate always.

Thanks!

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2 replies

isinhaAccepted solution
Employee
Jul 20, 2020 11:05 AM UTC

Hi @luca_lattarini ,

Are the number of customer ID crossing the uniques exceeded limit? In that case, it will be counted as 1 item. Also, please note that the function uses the HyperLogLog (HLL) method of approximating distinct counts.  It is configured to guarantee the value is within 5% of the actual value 95% of the time. So, it's not 100% accurate always.

Thanks!

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    PratheepArunRaj
    PratheepArunRaj
    New Participant
    Jul 20, 2020 4:21 AM UTC

    Dear Luca,

    What if the same Laptop is used for multiple logins? One Unique Visitor and multiple Customer IDs. Not possible?

    Thanks, Arun.

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