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#1
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rolling 12 month average
I need formula that will determine a rolling 12 month average. I'm starting
with individual days, so I need something that will recognise the start and end of each month, something that is date based rather than just count based. Any ideas? Thanks in advance! -- gevans |
#2
Posted to microsoft.public.excel.worksheet.functions
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rolling 12 month average
If you want to average for data in col d and dates in col a then try this
array formula which must be entered using ctrl+shift+enter vs just enter. =AVERAGE(IF(MONTH(ChecksA)=2,ChecksD)) -- Don Guillett SalesAid Software "gevans" wrote in message ... I need formula that will determine a rolling 12 month average. I'm starting with individual days, so I need something that will recognise the start and end of each month, something that is date based rather than just count based. Any ideas? Thanks in advance! -- gevans |
#3
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rolling 12 month average
Start of month (with date in A1)
=DATE(YEAR(A1),MONTH(A1),1) end =DATE(YEAR(A1),MONTH(A1)+1,0) 12 months ago from end of month subtract 12 =DATE(YEAR(A1),MONTH(A1)-11,0) =AVERAGE(IF((A2:A1000=DATE(YEAR(A1),MONTH(A1)-11,0))*(A2:A1000<=DATE(YEAR(A1),MONTH(A1)+1,0)),B2 :B1000)) will average values in B2:B1000 where dates in A2:A1000 are greater than 12 months from end of month of date in A1 AND smaller than end of month with date in A1 A1 can be replaced with TODAY() to use today's date needs to be entered with ctrl + shift & enter -- Regards, Peo Sjoblom Northwest Excel Solutions Portland, Oregon "gevans" wrote in message ... I need formula that will determine a rolling 12 month average. I'm starting with individual days, so I need something that will recognise the start and end of each month, something that is date based rather than just count based. Any ideas? Thanks in advance! -- gevans |
#4
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rolling 12 month average
Thanks, Peo, that will work just fine!
-- gevans "Peo Sjoblom" wrote: Start of month (with date in A1) =DATE(YEAR(A1),MONTH(A1),1) end =DATE(YEAR(A1),MONTH(A1)+1,0) 12 months ago from end of month subtract 12 =DATE(YEAR(A1),MONTH(A1)-11,0) =AVERAGE(IF((A2:A1000=DATE(YEAR(A1),MONTH(A1)-11,0))*(A2:A1000<=DATE(YEAR(A1),MONTH(A1)+1,0)),B2 :B1000)) will average values in B2:B1000 where dates in A2:A1000 are greater than 12 months from end of month of date in A1 AND smaller than end of month with date in A1 A1 can be replaced with TODAY() to use today's date needs to be entered with ctrl + shift & enter -- Regards, Peo Sjoblom Northwest Excel Solutions Portland, Oregon "gevans" wrote in message ... I need formula that will determine a rolling 12 month average. I'm starting with individual days, so I need something that will recognise the start and end of each month, something that is date based rather than just count based. Any ideas? Thanks in advance! -- gevans |
#5
Posted to microsoft.public.excel.worksheet.functions
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rolling 12 month average
Don, I don't understand the function (ChecksA), and I can't get your formula
to work. I am entering it as written, and using Ctr/Shift/Enter so it will enter as an array. -- gevans "Don Guillett" wrote: If you want to average for data in col d and dates in col a then try this array formula which must be entered using ctrl+shift+enter vs just enter. =AVERAGE(IF(MONTH(ChecksA)=2,ChecksD)) -- Don Guillett SalesAid Software "gevans" wrote in message ... I need formula that will determine a rolling 12 month average. I'm starting with individual days, so I need something that will recognise the start and end of each month, something that is date based rather than just count based. Any ideas? Thanks in advance! -- gevans |
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