st: split a large dataset

["ptrprtt@gmail.com" <ptrprtt@gmail.com>]

Dear Stata users,

I am trying to split a large dataset by firm. A possiblity would be to
preserve the original file and run a loop where I keep the
observations corresponding to each firm. The problem is that restoring
the original file takes a very long time. Is there a faster way to do
it?

Thanks for your help,

Pietro
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/