I have my data on one tab and my formula on a separate tab.

How do I use sumproduct when my info is on another tab. This is the formula
I am using and it's not working. All the data is text.

=SUMPRODUCT(('Aug 2008 Term Data'!R3:R180=S4)*('Aug 2008 Term
Data'!Q3:Q180=T1))

P.S. - I would also like it not to count blanks ...