#### Weighted Avg - using values from multiple sheets

```I maintain a spreadsheet for a telephone hotline.  We track total
number of calls received (column F) as well as average time to answer
the call (column J).  To analyze the month's average time to answer, I
use the following weighted average formula:  SUMPRODUCT
(J5:J26,F5:F26)/SUM(F5:26).

I have 2 questions relating to this:

1)  Is the above formula correct to determine the average speed to
answer?  I've assumed the weights to be the total number of calls

2)  I have a different spreadsheet for each month (Jan, Feb, etc.). How
can I properly show the weighted average as a Year-To-Date number?

Joel McBride

```
 0
2/23/2005 5:41:50 PM
excel 39879 articles. 2 followers.

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```JoelMcbride wrote...
>I maintain a spreadsheet for a telephone hotline.  We track total
>number of calls received (column F) as well as average time to answer
>the call (column J).  To analyze the month's average time to answer, I
>use the following weighted average formula:
>
>SUMPRODUCT(J5:J26,F5:F26)/SUM(F5:26).
....

Generally best to put formulas on new lines in newsgroup messages, and
if they're particularly long, break them at commas and +-*/ (but not ^)
into multiple lines.

You have a typo in the denominator - should be SUM(F5:F26).

>1)  Is the above formula correct to determine the average speed to
>answer?  I've assumed the weights to be the total number of calls

Should be if the col J averages are total answering times from some
other column divided by col F call counts. But if so, better to sum
that other column than use SUMPRODUCT on cols J and F in the numerator.

>2)  I have a different spreadsheet for each month (Jan, Feb, etc.).
How
>can I properly show the weighted average as a Year-To-Date number?

It gets ugly trying to make Excel work like a true 3D spreadsheet
(which it isn't). Easiest way to do this is to have a list of worksheet
names (Jan, Feb, etc.) in a range somewhere (I'll assume it's 12 rows
by 1 column) named WSLst, have the YTD month somewhere named YTDMon,
and use a formula like

=SUMPRODUCT(
N(OFFSET(INDIRECT("'"&OFFSET(WSLst,0,0,MATCH(YTDMon,WSLst,0),1)
&"'!J5:J26"),COLUMN(INDIRECT("RC1:RC22",0))-1,0,1,1)),
N(OFFSET(INDIRECT("'"&OFFSET(WSLst,0,0,MATCH(YTDMon,WSLst,0),1)
&"'!F5:F26"),COLUMN(INDIRECT("RC1:RC22",0))-1,0,1,1)))
/SUMPRODUCT(
N(OFFSET(INDIRECT("'"&OFFSET(WSLst,0,0,MATCH(YTDMon,WSLst,0),1)
&"'!F5:F26"),COLUMN(INDIRECT("RC1:RC22",0))-1,0,1,1)))

[And for those who believe I'm exaggerating how cumbersome this is in
Excel, here's a 123 equivalent.

@WEIGHTAVG(@@("Jan:J5.."&YTDMon&":J26"),@@("Jan:F5.."&YTDMon&":F26"))

Excel stinks for 3D.]

```
 0
hrlngrv (1990)
2/23/2005 8:36:30 PM
```Harlan-

```
 0
3/1/2005 5:41:34 PM

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