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Frequent Visitor

## Incremental Average Where Average Increments by Fixed Range Quantity

Hi all,

I need to create a calculated column that will take the geometric average (geomean) of all values in the Qe column that are between two depth values (0.4ft below and 0.2ft above the current record) in another column for each unique ParentID (5 given as an example below for ParentID but there would be overlapping depth and Qe values for other unique ParentID's so these would need to be grouped by ParentID). See data structure below and expected result shown as Qe (geomean).  I can do this in Excel because the formula will increment by 1 for each row with this formula:

=GEOMEAN(INDEX(\$A\$53:\$G\$1508, MATCH(A53-0.2,\$A\$53:\$A\$1508, 1), COLUMN(\$G:\$G)):INDEX(\$A\$53:\$G\$1508, MATCH(A53+0.4,\$A\$53:\$A\$1508, 1), COLUMN(\$G:\$G)))

Maybe I should refer to this as a moving geometric mean of a dynamic range of Qe values that is defined by a depth increment n - 0.2 and a n + 0.4.  I'm still a novice at Power BI, but it seems like this is something that could be done with defining a variable and an index, but I have had no luck as I'm struggling to tie together the concept of a dynamic range in Excel with the data structure in Power BI.

 ParentID Depth (ft) Qe Qe (geomean) 5.000 14.30 71.467 NA 5.000 14.37 88.993 NA 5.000 14.44 105.308 NA 5.000 14.50 118.375 104.629 5.000 14.57 122.578 108.511 5.000 14.63 124.480 111.827 5.000 14.70 124.457 112.951 5.000 14.76 122.672 112.636 5.000 14.83 116.447 111.392 5.000 14.89 109.397 110.079 5.000 14.96 104.377 108.725 5.000 15.03 99.520 107.309 5.000 15.09 99.340 105.761 5.000 15.16 102.127 NA 5.000 15.22 104.766 NA 5.000 15.29 107.587 NA 5.000 15.35 108.634 NA 5.000 15.42 107.743 NA 5.000 15.49 104.557 NA 5.000 15.55 101.423 NA
2 ACCEPTED SOLUTIONS
Super User IV

Not sure if I got the + and - part right, but this approach should work for your column.

Geomean =
VAR currentdepth = Depth[Depth (ft)]
RETURN
CALCULATE (
GEOMEAN ( Depth[Qe] ),
ALL ( Depth ),
VALUES ( Depth[ParentID] ),
Depth[Depth (ft)] >= currentdepth - 0.2,
Depth[Depth (ft)] <= currentdepth + 0.4
)

If this works for you, please mark it as solution.  Kudos are appreciated too.  Please let me know if not.

Regards,

Pat

Did I answer your question? Mark my post as a solution! Kudos are also appreciated!

Frequent Visitor

One of my colleagues helped figure this one out, not sure if this is a best practice in DAX or not but it worked:

Geomean =
VAR currentdepth = Depth[Depth (ft)]

VAR currentParentID = ( Depth[ParentID] )
RETURN
CALCULATE (
GEOMEAN ( Depth[Qe] ),
ALL ( Depth ),
currentParentID = ( Depth[ParentID] ),
Depth[Depth (ft)] >= currentdepth - 0.2,
Depth[Depth (ft)] <= currentdepth + 0.4
)

4 REPLIES 4
Super User IV

Not sure if I got the + and - part right, but this approach should work for your column.

Geomean =
VAR currentdepth = Depth[Depth (ft)]
RETURN
CALCULATE (
GEOMEAN ( Depth[Qe] ),
ALL ( Depth ),
VALUES ( Depth[ParentID] ),
Depth[Depth (ft)] >= currentdepth - 0.2,
Depth[Depth (ft)] <= currentdepth + 0.4
)

If this works for you, please mark it as solution.  Kudos are appreciated too.  Please let me know if not.

Regards,

Pat

Did I answer your question? Mark my post as a solution! Kudos are also appreciated!

Frequent Visitor

This works, except it is taking the geomean within the correct depth range, but it is performing the calculation across multiple unique Parent ID's. If I remove the Values(Depth[ParentID]) line then I get the same result. How would I get this calculation to only be performed within the Qe and Depth (ft) values within each unique ParentID? For example, I have 400 to 500 Qe and corresponding Depth (ft) values for each unique ParentID, and I do not want geomean of Qe taken between different ParentID's.

Frequent Visitor

One of my colleagues helped figure this one out, not sure if this is a best practice in DAX or not but it worked:

Geomean =
VAR currentdepth = Depth[Depth (ft)]

VAR currentParentID = ( Depth[ParentID] )
RETURN
CALCULATE (
GEOMEAN ( Depth[Qe] ),
ALL ( Depth ),
currentParentID = ( Depth[ParentID] ),
Depth[Depth (ft)] >= currentdepth - 0.2,
Depth[Depth (ft)] <= currentdepth + 0.4
)

Super User IV

I didn't see your response until now.  Glad that approach got you started in right direction.

If this works for you, please mark it as solution.  Kudos are appreciated too.  Please let me know if not.

Regards,

Pat

Did I answer your question? Mark my post as a solution! Kudos are also appreciated!

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