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| From | Abdul <bihiabdul@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: dropping incomplete frequencies without 'missing' in panel data |
| Date | Wed, 13 Jul 2011 16:39:08 +0200 |
Dear List, I have a panel dataset and I wanted to drop those observations where the variable 'hhnr' is missing in some time periods. for example when hhnr is 6, it is only reported in 2001 and not in subsequent years, whereas when hhnr is 9, it is reported in all years from 2001 to 2007. hhnr year volumew valuew 6 2001 770 4585 9 2001 9374 91672 9 2002 13576 145520 9 2003 4720 44709 9 2004 3429 30254 9 2005 5589.25 43225.37 9 2006 4577.1 44175.56 9 2007 6079.05 74066.045 13 2001 1273 11399 13 2002 1705 15619 13 2003 1306 11060 13 2004 728 5823 13 2005 331.2 2930.16 13 2006 541.2 2900.175 13 2007 635.6 2910.115 14 2004 467 5893 14 2006 360 4548 14 2007 897.15 11333.995 14 2007 897.15 11333.995 18 2001 4308 37267 18 2002 1234 13419 If those observations where hhnr is not there were reported as missing I could have used this FAQ: http://www.stata.com/support/faqs/data/dropmiss.html Unfortunately, they are just left out and I am unable to drop them despite many attmpts. I would appreciate if you either help me with a way to make them explicitly missing in this dataset or yet better if you konw a way to drop them and keep only those 'hhnrs' with complete frequency (reported in all years). Thanks, Abdul * * 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/