Hi Stata,

I want to delete the panel if it not contain firm_age = 0.
Any ideas?


year firmid firmage year firmid firmage
2001 10 0 2001 10 0
2002 10 1 2002 10 1
2003 10 2 2003 10 2
2004 10 3 2004 10 3
2005 10 4 2005 10 4
2006 10 5 2006 10 5
2005 44 2
2006 44 3
2007 44 4
2008 44 5
2009 44 6
2010 44 7