Need help with a formula that will give me the average of the prior 4 weeks

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Panama1182

New Member
Joined
Apr 3, 2018
Messages
23
My data set is as follows:
In columns starting on C3 I have week ending dates starting with 1/6/2018 all the way to column BB3. on Column C5 i have the week number starting at 1 going all the way to column BB5.
C6:M6 contains my data. I need a formula that will average the prior 4 weeks. I need a formula that will average I6:L6 and shift accordingly moving forward.
On cell BD4 i list the current week number and BD5 i list the week ending date based on the week number. I want a dynamic formula that will average the prior 4 weeks based on what is listed on BD5.

So for example, if BD5 says it is 3/17/2018 then i would like to average the prior 4 weeks (I6:L6) and when BD5 changes to 3/24/2018 i want the formula to average the prior 4 weeks (J6:M6)

Please help.
 

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Code: 
=AVERAGE(OFFSET(INDEX(C5:BB5,MATCH(BD4,C5:BB5,0)),0,-4):INDEX(C5:BB5,MATCH(BD4,C5:BB5,0)-1))
 
Upvote 0
[TABLE="width: 500"]
<tbody>[TR]
[TD]1/6/2018[/TD]
[TD]1/13/2018[/TD]
[TD]1/20/2018[/TD]
[TD]1/27/2018[/TD]
[TD]2/3/2018[/TD]
[TD]2/10/2018[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]2[/TD]
[TD]3[/TD]
[TD]4[/TD]
[TD]5[/TD]
[TD]6[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]905[/TD]
[TD]922[/TD]
[TD]940[/TD]
[TD]951[/TD]
[TD]965[/TD]
[TD]967[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

in this example the prior 4 week average if the current week was 2/10/2018 would be 944.5 which is the result of averaging 922,940,951,and 965. I need a formula that will calculate the prior 4 week average as new data comes in.
 
Upvote 0
Panama1182 said:
My data set is as follows:
In columns starting on C3 I have week ending dates starting with 1/6/2018 all the way to column BB3. on Column C5 i have the week number starting at 1 going all the way to column BB5.
C6:M6 contains my data. I need a formula that will average the prior 4 weeks. I need a formula that will average I6:L6 and shift accordingly moving forward.
On cell BD4 i list the current week number and BD5 i list the week ending date based on the week number. I want a dynamic formula that will average the prior 4 weeks based on what is listed on BD5.
So for example, if BD5 says it is 3/17/2018 then i would like to average the prior 4 weeks (I6:L6) and when BD5 changes to 3/24/2018 i want the formula to average the prior 4 weeks (J6:M6)
Please help.
Click to expand...

Hi!

Try the formulas below too:

In BD4

=MATCH(BD5,$C$3:$BB$3,0)

In BD6

=AVERAGE(OFFSET($C$6,0,BD4-2,1,-4))

In BD7

=AVERAGE(INDEX($C$6:$BB6,BD4-4):INDEX($C$6:$BB6,BD4-1))


[TABLE="class: grid, width: 1403"]
<tbody>[TR]
[TD][/TD]
[TD]B[/TD]
[TD]C[/TD]
[TD]D[/TD]
[TD]E[/TD]
[TD]F[/TD]
[TD]G[/TD]
[TD]H[/TD]
[TD]I[/TD]
[TD]J[/TD]
[TD]K[/TD]
[TD]L[/TD]
[TD]M[/TD]
[TD]N[/TD]
[TD]O[/TD]
[TD]BB[/TD]
[TD]BC[/TD]
[TD]BD[/TD]
[TD]BE[/TD]
[TD]BF[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD][/TD]
[TD="align: right"]06/01/2018[/TD]
[TD="align: right"]13/01/2018[/TD]
[TD="align: right"]20/01/2018[/TD]
[TD="align: right"]27/01/2018[/TD]
[TD="align: right"]03/02/2018[/TD]
[TD="align: right"]10/02/2018[/TD]
[TD="align: right"]17/02/2018[/TD]
[TD="align: right"]24/02/2018[/TD]
[TD="align: right"]03/03/2018[/TD]
[TD="align: right"]10/03/2018[/TD]
[TD="align: right"]17/03/2018[/TD]
[TD="align: right"]24/03/2018[/TD]
[TD="align: right"]31/03/2018[/TD]
[TD="align: right"]29/12/2018[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD="align: right"]12[/TD]
[TD]Week[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]5[/TD]
[TD][/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]2[/TD]
[TD="align: right"]3[/TD]
[TD="align: right"]4[/TD]
[TD="align: right"]5[/TD]
[TD="align: right"]6[/TD]
[TD="align: right"]7[/TD]
[TD="align: right"]8[/TD]
[TD="align: right"]9[/TD]
[TD="align: right"]10[/TD]
[TD="align: right"]11[/TD]
[TD="align: right"]12[/TD]
[TD="align: right"]13[/TD]
[TD="align: right"]52[/TD]
[TD][/TD]
[TD="align: right"]24/03/2018[/TD]
[TD]Date[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]6[/TD]
[TD][/TD]
[TD="align: right"]900[/TD]
[TD="align: right"]901[/TD]
[TD="align: right"]902[/TD]
[TD="align: right"]906[/TD]
[TD="align: right"]912[/TD]
[TD="align: right"]918[/TD]
[TD="align: right"]926[/TD]
[TD="align: right"]934[/TD]
[TD="align: right"]937[/TD]
[TD="align: right"]942[/TD]
[TD="align: right"]948[/TD]
[TD="align: right"]901[/TD]
[TD="align: right"]908[/TD]
[TD="align: right"]954[/TD]
[TD][/TD]
[TD="align: right"]940,25[/TD]
[TD]Result[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]7[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD="align: right"]940,25[/TD]
[TD]Result[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]8[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]***[/TD]
[TD]**[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**********[/TD]
[TD]**[/TD]
[TD]**********[/TD]
[TD]*******[/TD]
[TD]**[/TD]
[/TR]
</tbody>[/TABLE]


Markmzz
 
Last edited:
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