Calculate median, IQR, and min/max from count by group

[harisin22]

Hello:

I would like to calculate median, the IQR (25%, 75%), and min and max  of a count of values, by group. See example table below:

Input Table
Group	ID_Unique
A	1
A	2
A+B	3
B	4
C+A	5

The desired output will be in pivot table, structure as follows:

Desired Output
Group	Count(ID_Unique)	Median(Count(ID_Unique))	Fractile(Count(ID_Unique), 0.25)	Fractile(Count(ID_Unique), 0.75)	Mix(Count(ID_Unique))	Max(Count(ID_Unique))
A	2
B	1
A+B	1
C+A	1

I have spent a lot of time trying to figure how to calculate median/fractile (IQR) values from a count - I can't seem to figure this out.

Any help would be greatly appreciated.

Thank you,

Sin

[Oleg_Troyansky]

Hi,

what you are trying to do is called "nested aggregation" - you are trying to apply one aggregated function on top of another. In Qlik Sense, you have to use the AGGR() function or the TOTAL qualifier in order to nest aggregation functions. For example:

median(

     AGGR(

          count(ID), Group)

)

I'm teaching a whole 3-hours lecture on the rules and analytical uses of the AGGR() function at the Masters Summit for Qlik - check out our agenda and see if our advanced training is for you. We will be in Washington, DC and in Amsterdam, Netherlands this fall.

Cheers,

Oleg Troyansky