Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
From | Maarten buis <maartenbuis@yahoo.co.uk> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: generating age using dates |
Date | Fri, 17 Dec 2010 15:45:50 +0000 (GMT) |
--- On Fri, 17/12/10, martine etienne wrote: > I am trying to generate age using the following variables: > > "survey_date"=survey date > > "q1_dob2"=date of birth > > I started with the following command: > gen nage= survey_date- q1_dob2 > gen age= nage/365.4 > but I'm stuck at this point because it looks like the > numbers are very similar to each other, ie..I have a sample > of 287 and over 200 are 50 plus.... I would start looking at the distribution of the individual variables, e.g. spikeplot survey_date spikeplot ql_dob2 I would also look at the date format of both variables. If one is measured in days and the other in weeks then that would explain the weird results. You can see that by typing desc survey_date ql_dob2 Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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/