st: how to switch the values of a variable for two persons within the same household?

[xueliansharon <xuelianstata@gmail.com>]

Dear all,

I have a data file containing records for households with either 1 or 2
persons. I want to generate a new variable v2 based on an old variable v1,
and the values of the new variable v2 should satisfy the following
condition: 
If there are 2 persons within the household, then v2 should be constructed
by switching the values of v1 for the 2 persons, i.e. within each 2-person
household, v2[1] =v1[2] and v2[2]=v1[1]. 
If there is only 1 person within the household, v2 takes missing value.

Here is an example:
HHID        person ID       v1        v2
1             01                 1          3
1             02                 3          1
2             01                 2          .
3             02                10         55    
3             04                55         10

How to generate such v2 based on v1?

Thank you for your help in advance!

Best,
Sharon        



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