What I am trying to accomplish is this:
I am trying to use a for loop to create a table that generates a column
(aa). Based on the cells in AA, I want sumproduct (in column ab) to perform
add up the sums in another table (cause.column(3)) where the value in
causecats (which is the first column in the cause table) is equalt to the
value in AAr+1.

The values in AAr+1 are populated from a review of the values in causecats.

The code I am trying is this.
Cells(r + 1, "ab").Formula = "=sumproduct((" & causecats.Address & "=" & _
Cells(r + 1, "aa").Address & ")*(" & cause.Columns(3).Address & "))"

From my experimentation, I can not get the sumproduct to work unless I put
the value I am looking for within the first array in quotes. In other words,
I can not say
"=sumproduct((array1=a3)*(array2)"
This appears to only work if I put an actual value in place of a3 and place
it in quotes.
I think that is my problem above. Is there a way around it?

TIA