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[no subject]



Well, i would first drop the duplicate obsevations:
duplicates drop state county
and then use Dimitriy code.

On Fri, Jul 22, 2011 at 3:06 PM, Dimitriy V. Masterov
<dvmaster@gmail.com> wrote:
> Does this do what you want?
>
> collapse (count) county, by(state)
>
> DVM
> On Fri, Jul 22, 2011 at 2:59 PM, Ben Hoen <bhoen@lbl.gov> wrote:
>> Can someone help me to produce a table that counts the number of unique
>> occurrences of a group inside another group?
>>
>> For example assume I had the following table:
>>
>> Number  State   County
>> 1               NY      Madison
>> 2               NY      Madison
>> 3               PA      Somerset
>> 4               NY      Oneida
>> 5               PA      Somerset
>> 6               PA      Wayne
>> 7               PA      Luzerne
>>
>> I want to produce a table like this:
>> State   County
>> NY      2
>> PA      3
>>
>> Any ideas?
>>
>> Ben



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