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From | owner-statalist@hsphsun2.harvard.edu |
To | statalist@hsphsun2.harvard.edu |
Subject | st: From: John Singhammer <singhammer@gmail.com> |
Date | Thu, 16 Aug 2012 16:01:12 +0200 |
Hi I'm struggling with a problem that probably is easily solved. Apparently not by me, so any advices will be greatly appreciated The data looks like this: Children's height was measured at grade 0 and grade 1. Usually, you expect childrens height to increase. however, for id a19, height decreased, most likely due to measurement error id maxheight0 maxheight1 height grade a19 130 . 130 0 a19 . 126 126 1 y03 117 . 117 0 y03 . 127 127 1 I have 15.000 observation and wants to generate a variable of the difference in height from grade 0 to grade 1. That way, I can delete or correct those with a negative growth I've managed to isolate the measures for each grade but the next step is a mystery. Obviously, subtracting maxeighth1 from maxheight0 is not an obtion at this point. How do I manage to illuminate the difference in height between grades? I'll be happy for any suggestion Thanks Kind regards John * * 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/