st: RE: state the same for multiple observations?

["Richardson, Kelly K." <Kelly.Richardson@va.gov>]

This should work:

sort us_id state
list us_id if us_id==us_id[_n-1] & state~=state[_n-1]



Anyone have an idea of how I can do the following: 

The data looks something like this: 

us_id       state
1               CA
1               CA
2               VA
3               PA
3               TX

I need to know if when a us_id has multiple observations is the state
the same for each observation in that us_id.  If the state is different
for a given us_id I need to be able to easily identify those cases. 

Thanks in advance,
Marilyn. 
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