st: Group classification

[Mario Jose <mariojose276@gmail.com>]

Dear All,

I have a dataset with foreign subsidiaries over a period of time. Each
subsidiary is owned by an identified parent company. For each year,
there are parent companies with subs in a set of countries y1,.., yn
and parents with subs in a different set of companies x1, ..., xm.
There are also parent companies with subs in both set of countries. I
would like to allocate 0,1 to observations according to whether or not
the respective parent has subs in the countries x1,..., xm. For
instance, if a parent company has subs in y1, y2, y6 I want to
allocate 1 to all these observations, if another parent company has
subs in countries y1, y2 and x5 I want to allocate 0 to all subs of
that parent (because the parent has a subs in country x5).

Any suggestion on how to do this?
I will be grateful for any help.
Best regards,
Mario
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