Assuming the unique names are listed in E1 down
In F1: =SUMPRODUCT((A$2:A$100=E1)*(B$2:B$100=1))
Copy down. Adapt ranges to suit your actual extents
Success? hit the YES below
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Max
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"Vanessa Simmonds" wrote:
I need to count the frequency of a specific number within a list of values.

For Example:

A b
1 Vanessa 1
2 David 0
3 David 0
4 Silas 0
5 Marly 1
6 Vanessa 0
8 David 0
9 Marly 1
10 Silas 0
11 Silas 1
12 Marly 1
13 Vanessa 1

So I need a formula that will count the frequency of 1 on column b for
everytime column A equals Vanessa, David, Marly, Silas.

Results expected:

Vanessa 2
Marly 3
Silas 1
David 0

Thank you very much for your help.

Vanessa Simmonds