Thanks! That did the trick. Also, I was trying to sum F278:F306. I just
had some fat fingers when I typed the OFFSET formula.

"Harlan Grove" wrote:

> CMB wrote...
> ....
> >1. Using the OFFSET function:
> >
> >=SUM(OFFSET('[Daily-Data.xls]Daily'!$F$5,273,0,303,1))
> ....
> > 2. Using the INDEX function:
> >
> >=SUM(INDEX('[Daily-Data.xls]Daily'!$F$5:$F$369,274):
> >INDEX('[Daily-Data.xls]Daily'!$F$5:$F$369,302))
> ....
> >Both of these formulas work fine when the source workbook is open.
> ....
>
> These two formulas sum different ranges. The OFFSET formula sums
> F278:F580 while the INDEX formula sums F278:F306. Which do you want?
>
> The short but technical answer is that you're using both OFFSET and
> INDEX to return range references, but external references into closed
> workbooks *NEVER* resolve to range references, rather they're returned
> as arrays.
>
> You need to use something like the following.
>
> =SUMPRODUCT('[Daily-Data.xls]Daily'!$F$1:$F$580,
> (ROW('[Daily-Data.xls]Daily'!$F$1:$F$580)>=k)
> *(ROW('[Daily-Data.xls]Daily'!$F$1:$F$580)<=n))
>
> If you want to sum F278:F580, make it
>
> =SUMPRODUCT('[Daily-Data.xls]Daily'!$F$1:$F$580,
> (ROW('[Daily-Data.xls]Daily'!$F$1:$F$580)>=278)
> *(ROW('[Daily-Data.xls]Daily'!$F$1:$F$580)<=580))
>
>