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Max_Kloosterman Frequent Visitor
Frequent Visitor

Calculating a measure that gives me the "right" average ...

Hi,

 

Earlier I received help form @LivioLanzo to resolve my question on how to structure my data. That worked However ... a new question came up that I cannot seem to resolve. It is about calculating a measure that does NOT do a weighted average :-)

 

I want to use this measure in a visualisation so that it shows: (in table form)

respondentquestioncategoryquestionscoreaveragebyquestionaveragebyquestioncategoryaveargebyrespondent
resp1cat1cat1.15554,5
resp1cat1cat1.25554,5
resp1cat1cat1.35554,5
resp1cat2cat2.15544,5
resp1cat2cat2.23344,5

 

Regardless of the number of questions in a category, each respondent will need to get an average based on the average over all categories. To calculate the total, each category should have one vote. In the example above. The average should be 4,5 as in the table above. I however keep getting 4,6 (the weighted average)

 

My key problem seems to be how to create a function that iterates not over each row but over a new/filtered? table that contains only the average for a category. Is that at all possible, to use DAX to create a virtual table that contains a subset of rows and columns from the original table as well as the values from a measure?

 

I even find it difficult to do this in excel so thinking through this problem proves to be harder than I thought it would be - even though the concept seems so straightforward.

 

Kind regards,

 

Max

 

Earlier (resolved) post https://community.powerbi.com/t5/Desktop/Average-of-answer-by-question-with-multiple-value-types/m-p...Smiley Tongue

1 ACCEPTED SOLUTION

Accepted Solutions
Max_Kloosterman Frequent Visitor
Frequent Visitor

Re: Calculating a measure that gives me the "right" average ...

I thought I solved this question myself - until it turned out I didn't

the path I tried: is to use the formula suggested (the allselected (values version ) to calculate the average for each category and then using that formula inside another calculation that divides the sum of those averages for a respondent by the distinctcount of categories for a respondent. IT came up with the correct average in the total row in the bottom of the table, however I couldn't get it to work on the rows of the table.

Will remain interested in any working and preferably a very elegant approach. 

Kind regards,

Max

DAX I ended up trying that got me close but not quite there:

Average Scores := calculate ( average( table[score], filter ( table, table[score] <>0))

Average by respondent := averagex ( values ( questioncategory) , [Average Scores]))

Kind regards,
Max
3 REPLIES 3
Community Support Team
Community Support Team

Re: Calculating a measure that gives me the "right" average ...

Hi @Max_Kloosterman ,

You can add use allexcept to choose which fields filtered formula calculation.

Sample:

 

Count Measure =
CALCULATE (
    AVERAGE ( Table[Score] ),
    ALLSELECTED ( Table ),
    VALUES ( Table[ColumnName] )
)

Count Measure2 =
CALCULATE ( AVERAGE ( Table[Score] ), ALLEXCEPT ( Table, Table[ColumnName] ) )

 

Regards,

Xiaoxin Sheng

Community Support Team _ Xiaoxin Sheng
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.



For learning resources/Release notes, please visit: | |
Max_Kloosterman Frequent Visitor
Frequent Visitor

Re: Calculating a measure that gives me the "right" average ...

Hi @v-shex-msft 

 

I've tested this solution and it still gives me 4,6 and not 4,5... this is proving to be a hard one. Any other idea's?

 

To understand it better I've looked at a couple of lessons on The ALL, ALLSELECTED and ALLEXCEPT filters today and am learning more and more. Thanks for that. 

 

One additional question / complication: In my real table respondents are able to score 0 to indicate that they did not want to answer that question. I am trying to figure out where to filter out those values. i.e. where do I insert a filter that ensures only values are considered that fullfil the condition Table[score]<>0? For the interim I have dealt with this by changing all 0 scores to null upon import of the data.

 

Kind regards,

 

Max

Max_Kloosterman Frequent Visitor
Frequent Visitor

Re: Calculating a measure that gives me the "right" average ...

I thought I solved this question myself - until it turned out I didn't

the path I tried: is to use the formula suggested (the allselected (values version ) to calculate the average for each category and then using that formula inside another calculation that divides the sum of those averages for a respondent by the distinctcount of categories for a respondent. IT came up with the correct average in the total row in the bottom of the table, however I couldn't get it to work on the rows of the table.

Will remain interested in any working and preferably a very elegant approach.&nbsp;

Kind regards,

Max

DAX I ended up trying that got me close but not quite there:

Average Scores := calculate ( average( table[score], filter ( table, table[score] <>0))

Average by respondent := averagex ( values ( questioncategory) , [Average Scores]))

Kind regards,
Max

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