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Group and average unique values from a list in ms excel

5/6/2019

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Last week I demonstrated how to get a dynamic list of unique values in MS Excel. Today, I want to show how to also calculate averages (or other relevant statistics) for each unique value.

Consider the table below containing a list of employees and their commissions earned on various different dates. 
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Here is how to get the average commission earned per unique employee from this list:

STEP 1] use the formula from my last blog post in order to get a dynamic list of unique values from the table above.


{=IFERROR(INDEX($B$2:$B$667, MATCH(0,COUNTIF($F$1:F1, $B$2:$B$667), 0)),"")}
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STEP 2] Use the following formula to calculate the average for each unique record.

=SUMIF($B$2:$B$18,$E2,C$2:C$18)/COUNTIF($B$2:$B$18,$E2)
Picture
​
​This formula first sums the values in that list that corresponds to the unique records i.e.  SUMIF($B$2:$B$18,$E2,C$2:C$18) 

then the second part of the formula divides that number by the number of times that unique record has been repeated in the original table
i.e.  COUNTIF($B$2:$B$18,$E2)

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