st: counting events

[Ana Gabriela Guerrero Serdan <ag_guerreroserdan@yahoo.com>]

HI, 

I am struggling on the following. I need to count the
events or number of incidents where people died. I
have information at the individual level such as: 

 +----------------------------+
       | count   incident       sex |
       |----------------------------|
    1. |     1       x007   unknown |
    2. |     2       x038      male |
    3. |     3       x038      male |
    4. |     4       x038      male |
    5. |     5       k000    female |
       |----------------------------|
    6. |     6       k000 unknown |
    7. |     7       x038   unknown |
    8. |     8       x038   unknown |
    9. |     9       x038   unknown |
   10. |    10       x038   unknown |

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