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RE: st: generating age using dates


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: generating age using dates
Date   Fri, 17 Dec 2010 17:19:42 +0000

How did you "encode" that? 

Nick 
n.j.cox@durham.ac.uk 

martine etienne

the variable q1_dob2 is the only one that I generated from encoding the original 
variable q1_dob which was is in string format:


des q1_dob

              storage  display     value
variable name   type   format      label      variable label
----------------------------------------------------------------------------------------------------------------------

q1_dob          str10  %10s        

all years are four digits, see below:

tab q1_dob

     q1_dob |      Freq.     Percent        Cum.
------------+-----------------------------------
 01/04/1956 |          1        0.35        0.35
 01/05/1964 |          1        0.35        0.70
 01/05/1968 |          1        0.35        1.05
 01/06/1956 |          1        0.35        1.39
 01/06/1963 |          1        0.35        1.74
 01/07/1960 |          1        0.35        2.09
 01/10/1975 |          1        0.35        2.44
 01/12/1957 |          1        0.35        2.79
       
also, there is only one missing date of birth in the original variable and it is 
coded as 99/99/9999, there
are no missing dates in the survey_date variable.


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