st: Getting a random sample from panel data

["Christer Thrane" <ch-thran@online.no>]

Hi,

In my panel data (one observation per year), the variable lpnr identifies
persons and the variable aar identifies panels.

I wish to obtain a 10% probability sample that is representative in terms of 
persons (lpnr). But if the person is selected, I want to follow him or her 
throughout the panels (aar).

Findit "random sample" did not help me, though.

Any help is appriciated.

Best regards,

Christer Thrane
Lillehammer University College
Norway 

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