I did the math myself, so of course it's not correct.

The question is:

Is it possible to "Anchor" a running sum formula based on changing
replacing $R$7 with $R$67 for example) IN THE FORMULA,
there are 24,000 rows and every 60 or 70 rows, the SUM
formula has to be anchored all over again.
criteria with some kind of vlookup/Sumif (or something else)?



"Biff" wrote in message
...
Hi!

Hmmm....

The formula to do this is fairly simple but I'm not getting the results
you
have posted.

10/10 = 100% that one's OK
5/(10+15) = 25% this one is not correct, should be 20%

Everything below that one for product 100 is incorrect.

Based on the pattern shouldn't this:

12/(10+15+12)

Be:

2/(10+15+12)

Here's the formula:

=P7/SUMIF(Product_column$7:Product_column7,Product_col umn7,R$7:R7)

Replace Product_column with the letter of the actual product column. I
can't
tell from your table what that might be!!!

Copy down as needed.

Biff

"J Shrimps, Jr." wrote in message
...
Need to divide a value in a column by a set of
running sum values in an adjacent column.
Data looks like this:

Product Month Bal RemBal Result
Calculation:
100 01 $10.00 $10 100%
10/10
100 02 $5.00 $15 25%
5/(10+15)
100 03 $2.00 $12 32%
12/(10+15+12)
.....
100 60 $9.00 $9 .01%
9/(10+15+12+ 60 months of balances )
400 01 $8.00 $8 100%
8/8
400 02 $5.00 $35 19%
5/(8+35)

now we have a new value and the month's sequence starts at 1 (01).

Currently the formula is:
row 8 =P8/SUM(R$7:R8)
row 9 =P9/SUM(R$7:R9)
row 10 =P10/SUM(R$7:R10)
row 11 =P11/SUM(R$7:R11)
in this case, the new product started at row 7 and might continue
for 60 more rows, or just 6 more, where the $R$7 part of the formula
would
change again.

Usually, every 60 or so lines, (the # of months is different, depending
on the product) l have to re-start the formula (replacing $R$7 with
$R$67
for example) so the SUM starts with month
0 and continues summing the contents of column R ,
until the last month for that product.

I have over 24,000 lines of this, it is getting very tedious to have to
re-copy the
formula every time there is a new product., making sure my formula
captures
a running sum starting with the first month and divides the value in
the
current row
into that running sum.
I'm planning on starting with "IF(P8<p7" - ie a new product has started
so start the forumula using the current row as the cell placed in the
formula
"sum($R$7", start the running sum up,
and divide the contents of the current row into the running sum values
until
a new product, where the process starts all over again.
Is it possible to "Anchor" a running sum formula based on changing
criteria
with some kind of vlookup/Sumif (or something else)?