Average error in total

[aktripathi2506]

HI,

Please see below the example. In a table/matrix the total of average value is different from the real average.

This is what it look likes in power BI:

 

And when we calculate the average of same number in excel then it is different…it is off by some small number but I need it exactly same or the reason behind it.

week	Average of AB	Average of BC
1	69.00%	67.67%
2	77.60%	63.28%
3	74.60%	58.85%
4	89.40%	67.36%
5	88.90%	72.01%
6	95.80%	72.96%
7	97.60%	93.03%
8	96.90%	88.91%
9	99.50%	99.08%
10	77.20%	66.94%
11	94.30%	89.35%
12	80.00%	88.72%
13	82.90%	89.80%
average	86.44%	78.30%

As we can see in both the tables, even after having the same number the average of average is different.

[Vvelarde · Accepted solution]

You need to do an Average of the averages because the total that you see is Allvalues/All Rows.

TO solve this use:

AverageAB = AVERAGEX(SUMMARIZE('Table';'Table'[week];"TheAverageAB";Sum('Table'[A])/Sum('Table'[B]));[TheAverageAB])

You can change with your columns name.

[aktripathi2506]

Hi @Vvelarde,

Thank you.

In the formula for the measure, I did not understand this part:

Sum('Table'[A])/Sum('Table'[B]))

What is 'Table'[A]and 'Table'[B] representing here with respect to the table I have used as an example.

'AB' is the name of one column, there is no column named A or B.

Thanks.

[Vvelarde]

Change to this:

AverageAB = AVERAGEX(SUMMARIZE('Table';'Table'[week];"TheAverageAB";Average('Table'[AB]));[TheAverageAB])

[Vvelarde]

@aktripathi2506

Ok, i think that is a average of two columns (A & B).

Change to this:

AverageAB = AVERAGEX(SUMMARIZE('Table';'Table'[week];"TheAverageAB";Average('Table'[AB]));[TheAverageAB])

[Vvelarde]

You want an average of all averages. In excel you are using for the total  the formula verage(Alltheaverages Range) is correct?

The average that you are seeing in the visual is: AllmyValues/NumberofRows so the result is different.

You can use this measure to solve this:

AverageofAB= AVERAGEX(SUMMARIZE('Table';'Table'[week];"AverageAB";Sum('Table'[ValuesA])/AVERAGE('Table'[B]));[AverageAB])