Dynamic Average

[Big H]

Hi There,

I have a spreadsheet that each week i have to average the last 8 week
inputs, as you can image each week the last 8 weeks information changes. Any
help would be appreciated.

thanks Big H

 

[Biff]

Hi!

So, what you want to do is average the last 8 entries, correct?

Is the data in a column or a row?

Are there any empty cells within the range?

Biff

 

[Big H]

Hi Biff,

The data is in the row and if there is a zero, i would want to include it in
the calculation

thanks Harry

 

[RagDyeR]

Try this *array* formula for data in A1 to Z1:

=AVERAGE(Z1:INDEX(A1:Z1,LARGE(COLUMN(A1:Z1)*(A1:Z1<>""),8)))

--
Array formulas are entered using CSE, <Ctrl> <Shift> <Enter>, instead of the
regular <Enter>, which will *automatically* enclose the formula in curly
brackets, which *cannot* be done manually.

--

HTH,

RD
=====================================================
Please keep all correspondence within the Group, so all may benefit!
=====================================================

Hi Biff,

The data is in the row and if there is a zero, i would want to include it in
the calculation

thanks Harry

 

[Biff]

Hi!

Another way: (assumes no empty cells within the range and that cell A1 is
header)

=AVERAGE(OFFSET(A1,,COUNT(1:1),,-8))

You may want to make sure there are at least 8 values to average:

=IF(COUNT(1:1)<8,"Insufficient Data",AVERAGE(OFFSET(A1,,COUNT(1:1),,-8)))

Biff