# DAX Dynamic Banding | Calculated Member based on Calculated Field

Good morning,
I've created a Power Pivot model that measures the blood glucose levels of clinical patients at specific times of the day. The requirement is that this metric, let's call it GlucoseLevel, is always averaged as it wouldn't make sense to sum up the values.
To meet this first requirement, I set the "Summarize By" property of the GlucoseLevel column to "Average".
The second requirement is to band the GlucoseLevel values so that groups of people can be measured by this band rather than by the individual measure values. I created a banding table in Excel and then imported it into the Power Pivot model. The banding table
has three columns (BandName, MinValue and MaxValue) and has the following values:
VERYLOW: Min Value = 0; Max Value = 3.99
OK: Min Value = 4; Max Value = 6.99
WARNING: Min Value = 7; Max Value = 10.99CRITICAL: Min Value = 11; Max Value = 30.00
It is at this point where I face my challenge. I have a GlucoseLevel measure and I have a banding table. Great. The challenge is: How do I create a calculated, dynamic
member that will look at my GlucoseLevel measure (at whatever level), do a lookup to my banding table, and then return the "BandName" column from the Banding table at that specific level? So to clarify what I mean by level: I want to be able
to view the bandings at Year level, or a Month level, or even at a week level. Then depending on what level I am at, my measure should have a Band associated to it.
I've tried to solve this issue in a couple of ways:
Attempt 1
Create a calculated column in my fact table that contains a nested IF statement to manually band my GlucoseLevel values. This works fine if I view my data at the lowest level of granularity, however
it does not work if I start looking at my data at the day, week, month etc. levels
Attempt 2
1.) Create a calculated field (not a calculated column) that averages my GlucoseLevel measure. This is cool because it will average my measure at whatever level I am viewing it at. Let's call
this field Bob...
2.) Band my measure Bob by creating another calculated field (called PatientBand). This field uses my banding table (described earlier) in conjunction with my calculated field Bob. This works perfectly, except for one big flaw: Excel sees this banding field
as a measure, and not as something that I can use as a column / row...
So my question is: Can I trick Excel into viewing my PatientBand calculated field as an attribute, and not as a measure? And if not, how do I get around this challenge? Here is the DAX formula that I used to create my second calculated field "PatientBand":
PatientBand:=CALCULATE(
VALUES (Bandings[BandName]);
FILTER (
Bandings;
Test[Bob] >= Bandings[MinValue]
&& Test[Bob] <= Bandings[MaxValue]
Thanks!

So there are 2 ways that I can think of for doing that.
1) if you are only using MDX clients like Excel or Reporting services you can create a text based measure that returns the banding name. (Note that this sort of approach does not work at the moment with PowerView as it only displays numeric measures). This
would effectively let you show a label next to a reading as opposed to moving the reading under a given banding column.
Banding Name :=
CALCULATE (
VALUES ( Bands[BandName] ),
FILTER (
Bands,
&& [Average of GlucoseReading] <= Bands[BandMax]
&& NOT ( ISBLANK ( [Average of GlucoseReading] ) )
2) This next approach will show the results exactly as you had them in your sample screenshots. It just takes a slight bending of the DAX. I'm using a SUMX here, not because I want to sum anything, but because the "X" version of SUMX basically loops over
every row in the specified table and sums the expression in the second parameter. I have setup the second parameter so that it only returns a single value for the average if it is in the appropriate banding.
Banded Average:=IF (
HASONEVALUE ( Bands[BandName] ),
SUMX(
'Bands',
IF (
NOT ( ISBLANK ( [Average of GlucoseReading] ) )
&& [Average of GlucoseReading] >= MIN ( Bands[BandMin] )
&& [Average of GlucoseReading] <= MIN ( Bands[BandMax] ),
BLANK()

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