You can use -egen, seq()- to set up a 
structure of identifiers. Recall that this 
was an answer to one of your previous questions. 
Alternatively, if you want to mimic the structure
of the USA, just borrow a real dataset with 
existing identifiers and then create your 
"random counts" according to whatever precise
recipe you have in mind. 
Nick 
[email protected] 
[email protected]
 
> I want to create a dataset which has a hierarchical linear structure.
> for example, a structure of states, counties:
> 
> 50 states in total. For each state, create counties with 
> random county counts.
> Then for each county, create school districts with random counts.
> 
> Does anyone have any idea how to do this by stata?
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