st: panel data

["Andrey V. Ivanov" <aivanov@rumms.uni-mannheim.de>]

Hi, all.

Suppose I have the following data:

personal_number	employment	year
1			perm		1997
1			perm		1998
2			un-Emp	1997
2			self-emp	1998
3			perm		1997
3			self-emp	1998
4			self-emp	1997
4			perm		1998

Now, I want Stata to tell me how many people were self-employed in this  
data-set at SOME point in time. (3)

Next, I also want stata to list the whole employment history of anyone who  
has been self-employed at SOME point in time.

Could you please assist me?

Many thanks
andrey

--
Chair for Applied Microeconomics, Department of
Economics, Mannheim University, D-68131 Mannheim, Germany
Website: http://www.vwl.uni-mannheim.de/gk/_ivanov/
Co-editor of JEPS: http://jeps.repec.org/

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/