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Calculation using rolling 4 week amounts
Folks
A colleague has developed a spreadsheet into which he inputs numbers over 4 weeks. These numbers are added together and divided by 4 to give an average amount. this average amount is used in a number of other calculations around the spreadsheet. Is it possible to write a formula which will automatically add the next week's amount, and drop off the previous 4th week? If not, any ideas what the best solution will be? He is currently changing everything manually. Eg weeks might be 31/10/05 07/11/05 14/11/05 21/11/05 how can he automatically drop off 31/10/05 and include 28/11/05. Thanks for all your help Janet |
#2
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Calculation using rolling 4 week amounts
That's simple.
A1:E1: DATES A1:D1: Date1, Date2, Date3, Date4... A2:D2: Val1, Val2, Val3, Val4... $A$4=COUNT(A1:E1)-4 or $A$4=COUNT(DATES)-4 Moving 4-Period Formula: =SUM(OFFSET(A2,0,$A$4,1,4)) Remark: Insert New Column BEFORE last column which is E. -- HTH Tomek Polak, http://vba.blog.onet.pl |
#3
Posted to microsoft.public.excel.misc
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Calculation using rolling 4 week amounts
Thanks Topola - that was a great help :-)
"topola" wrote: That's simple. A1:E1: DATES A1:D1: Date1, Date2, Date3, Date4... A2:D2: Val1, Val2, Val3, Val4... $A$4=COUNT(A1:E1)-4 or $A$4=COUNT(DATES)-4 Moving 4-Period Formula: =SUM(OFFSET(A2,0,$A$4,1,4)) Remark: Insert New Column BEFORE last column which is E. -- HTH Tomek Polak, http://vba.blog.onet.pl |
#4
Posted to microsoft.public.excel.misc
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Calculation using rolling 4 week amounts
I just saw it. Simpler method:
=SUM(OFFSET($E$2,0,-4,1,4)) Isn't Excel funny? TP |
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