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Need to calculate monthly averages from daily values

  1. #1
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    Need to calculate monthly averages from daily values

    Please see attached spreadsheet. I would like to have a formula or macro that computes the values for column B in sheet 2 of my spreadsheet. These values should be monthly averages of the daily values listed in column B of sheet 1. As an example, cell B2 in sheet 2 should = average(sheet1!B2:B23)
    Attached Files Attached Files
    Last edited by smiso24; 07-13-2011 at 01:11 PM.

  2. #2
    Forum Expert royUK's Avatar
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    Re: Need to calculate monthly averages from daily values

    A PivotTable would be the best way
    Attached Files Attached Files
    Hope that helps.

    RoyUK
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  3. #3
    Forum Expert Paul's Avatar
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    Re: Need to calculate monthly averages from daily values

    This nice long array formula would work, too. Not quite as neat or efficient as a pivot table though.

    =SUMPRODUCT(--(MONTH(Sheet1!$A$2:$A$1000)=MID(A2,FIND(".",A2),3)*100),--(YEAR(Sheet1!$A$2:$A$1000)=LEFT(A2,4)*1),Sheet1!$B$2:$B$1000)/COUNT(IF(MONTH(Sheet1!$A$2:$A$1000)=MID(A2,FIND(".",A2),3)*100,IF(YEAR(Sheet1!$A$2:$A$1000)=LEFT(A2,4)*1,Sheet1!$A$2:$A$1000)))

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