st: creating an unique household identification number

["Simo Hansen" <simohansen@gmail.com>]

Dear All,
I have a household level data that includes a batch number and within each
batch number household id numbers. It looks like in the following form:

Batch_nu          hhid_nu
10100025          1                 
10100025          2        
10100025          3      
10100031          1
10100031          2
10100031          3
10100037          1
10100037          2
10100037          3
 My question is that how I can create an unique identification number for
each household using batch_nu and hhid_nu.
Thank you.
Best regards,
Simo


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