Stata - How to sample and randomize

[@Cathay_Pacific]

Thank you, professor.

[@hemnkhdr5658]

Thanks for your great explanation.

[@marciomengue9541]

Very good!

[@aminaahmedalibelal5676]

Nice. But how i can run any command on the 20% dataset or 80% dataset? thanx

[@SteffensClassroom]

As explained. You set your random sample, and then you can set dummy variables to indicate different pieces of your dataset.