st: Table to count how many times an event occurs with another

[Katia Bobulova <katia.bobulova@googlemail.com>]

Dear All,

I have many events in my dataset and I want to count how many times
one event happens with another one.

Assuming fro example 4 events and ten observations, I would like to
have a table like this:

     x1 x2 x3 x4
x1  10  2   1  3
x2  1  10  0   0
x3  0  3   10  1
x4 2   5   0   10

Could you please help me?

Thank you very much.

Katia
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