Actually, the outer IF() is unnecessary. You could reduce to simply
=SUMPRODUCT((A1:A$2=A2-1)*(B1:B$2=B2),C1:C$2)+1
in C2 and copied down.

Jerry

"Jerry W. Lewis" wrote:

Simply change $1 to $2 everywhere in the formula.

Jerry

"Eco" wrote:

It Doesn't works, I think because in file 1 there are the tittles of each
column. I couldn't manage to adaptate it correctly.

Thanks anyway.

"Jerry W. Lewis" escribió en el mensaje
...
=IF(A2=A$1,1,SUMPRODUCT((A$1:A1=A2-1)*(B$1:B1=B2),C$1:C1)+1)
in C2 and copied down.

Jerry

"Eco" wrote:

Hi, I need a formula to count the number of times an Item is repeated in
consecutive days from a list.

For example:
A B C
*******************
1 * Date Item Repeated
2 * 1-jun Item1 1
3 * 1-jun Item2 1
4 * 2-jun Item1 2
5 * 2-jun Item3 1
6 * 3-jun Item1 3
7 * 3-jun Item3 2
8 * 3-jun Item4 1
.....
...
..

NOTES:
- My list contains consecutive days including weekends.
- Each Item is not repeated in the same day.
- Each day, the number of Items appeared could be different.
- My list is ordered by date from the older to the newest.

Thanks in advance for your help.