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Grand average of column averages per category

  1. #1
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    Grand average of column averages per category

    Hi there,

    I am looking for a simpler formula to the one I am currently using (although I do get the correct result now).

    My data set consists of a "bidding round", where each supplier (denoted by their "company_ID") can contribute with an offer. See below:

    Company_ID Bidding_round % offered
    2 339 0,1601029
    3 339 0,25131899
    4 339 0,425201123
    2 340 0,497990223
    2 354 0,3796
    4 354 0,356
    3 354 0,2728
    1 354 0,52
    2 341 0,444
    19 339 0,403124415
    20 354 0,583024

    The end goal is to calculate a grand total average of the average of each category separately. That is, not by adding up all the "% offered" and divide by the number of offers (8), but rather by finding the average for company 2, 3, and 4, respectively, and then averaging those three numbers to obtain the grand total average. One extra condition is that a supplier must have submitted at least two offers to be included in the average (which is why supplier 1, 19 and 20 is excluded in the pivot). Currently, the calculated column "Bud[at least two offers from same supplier]" returns true if this is true, and nothing if false, and that column is then used as a report filter.

    So far, I have been using the following code:

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    Since I am operating with a supplier list of more than 20 suppliers, this formula is not really scalable, so I am looking for a better alternative.

    I have included two images below of output of the Pivot Table for visualization. The column "correct average" contains the correct values, specifically 34,1% (I only need the total, that is, the 34,1%)

    Sample image 1.png

    Sample image 2.png

    339, 340, 341, and 354 are the bidding rounds.

    Enclosed, please find a sample workbook.

    Thank you in advance.

    Attached Files Attached Files
    Last edited by Phil123456789; 03-06-2020 at 06:07 AM.

  2. #2
    Forum Guru Pepe Le Mokko's Avatar
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    Excel 2010 on Linux

    Re: Grand average of column averages per category

    Administrative note

    Welcome to the forum

    in your haste to solve your problem, you probably missed the yellow banner advising how to get answers faster by posting a sheet ?

    Please take a moment to read it and attach a sheet accordingly.

    Thanks you for helping us help you
    Be very, very careful using IFERROR ! It hides ALL errors which is not always what you want to get correct results

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