You can place the sheet names in an array of cells. In the following
formula I assume 8 sheet names are in cells K1:K8. Then you can use the
following variant of Bob's formula:

=SUMPRODUCT(N(INDIRECT(K1:K8&"!A1")),N(INDIRECT(K1 :K8&"!B1")))

HTH
Kostis Vezerides

On Jan 25, 8:59 pm, wrote:
HI Bob,
Thank you for the prompt reply, I am still having some trouble and
would really appreciate some help. I can seem to figure out how to
properly apply the formula.
For "Sheet" do input the series of sheets that I would be gathering
data from or is this just code?
(1:3) is this for the sheet names? A1 and B1 are these the cells I will
be using as a source for the data? Is N determined by the data source
or do I need to identify it?

=SUMPRODUCT(N(INDIRECT("Sheet"&ROW(1:3)&"!A1")),N( INDIRECT("Sheet"&ROW(1:3)¬&"!B1")))

Basically I have several sheets KState, Michigan, NYU, UCLA and each
has a number of employees (5,6,7,8) and the mean salary(85000,
90000,75000, 80000), I would like to get the weighted mean of these on
a separate sheet. Any further help would be greatly appreciated.
Thanks again,
Sarah

On Jan 25, 11:28 am, "Bob Phillips" wrote:

=SUMPRODUCT(N(INDIRECT("Sheet"&ROW(1:3)&"!A1")),N( INDIRECT("Sheet"&ROW(1:3)*&"!B1")))

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HTH

Bob

(change the xxxx to gmail if mailing direct)

wrote in ooglegroups.com...

I am trying to create a weighted average on one sheet calculated from
several other sheets. I need to use the product of just two cells on
each sheet for the weighted average. I know I cant use sumproduct in
3D, is there another way around this problem?

Thanks,

Sarah- Hide quoted text -- Show quoted text -