# Re: Problems referencing dates with the MATCH formula

Okay, with that layout this formula will return the column ID as a
letter (or letters):

=IF(MATCH(B2,D\$1:BD\$1,0)+3>26,CHAR(INT((MATCH(B2,D\$1:BD\$1,0)+2)/
26)+64),"")&CHAR(MOD(MATCH(B2,D\$1:BD\$1,0)+2,26)+65)

(I'm sure there must be a better way, but this works for now!!)

So, your average formula will be (in C2):

=AVERAGE(INDIRECT("D"&ROW(C2)&":"&IF(MATCH(B2,D\$1:BD
\$1,0)+3>26,CHAR(INT((MATCH(B2,D\$1:BD\$1,0)+2)/
26)+64),"")&CHAR(MOD(MATCH(B2,D\$1:BD\$1,0)+2,26)+65)&ROW(C2)))

I've had to use the ROW function in order for the row reference to
increment as you copy the formula down - it doesn't matter what
reference is actually in there, though I've used C2.

So, copy this down and it should give you what you want - obviously,
if you have no values in columns D to BD then you will get #DIV/0
error, and if you have no date in column B you will get the #N/A
error, so you might want to trap these before copying down.

Hope this helps.

Pete

On May 13, 11:02 am, Harry Flashman <flashdav...@xxxxxxxxx> wrote:

I am sorry Pete. You have actually been a big help and you have helped
improve my understanding a lot.
I tried to keep my example simple. Also I made a typo in my first
post.
"In Column D to A I have the product sales by month." It should not
have ben D to A.
I meant "Column D to Z I have product sales by month".
In my real speadsheet I actually have Column D to BD, that is months
Mar-08 to Dec-03.
Column A contains the names of the products.
Column B contains the months the product was first sold (format mmm-
yy)
Column C contains the average monthly sales from the time that the
specific product was first sold. The first date of sale varies from
product to product.
Column D to BD is the months (format mmm-yy)

Put simply I am calculating the average sales of each product. But I
need something a little more sophisticated than just =AVERAGE(D:BD)
because not all products went on sale for the first time at the same
time.

The array formula you provided would be okay except that in some
months a product may sell zero. I still want to include that zero in
my average
.

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