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st: append


From   "Araujo, Edson" <EAraujo@qmu.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: append
Date   Sat, 8 Mar 2008 14:37:54 -0000

Dear STATA lister, 
 
When using the command "append" to combine datasets what to do if the same variables have different alternatives in the different survey editions (as in the example below - 2006=4 answers and 2002=3 answers)? Is it a problem or can be ignored?
Thanks! Edson
 
 
 use "C:\Documents and Settings\aksd\stata1\dataset2006.dta", clear

ta literacy
 
    for those with codes |
  10-17 in column 4 aged |
        10years and abov |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
unable to read and write |      6,177       34.56       34.56
             able to read only |        896        5.01       39.57
     able to read and write |     10,797       60.40       99.97
                       uses braille |          5        0.03      100.00
-------------------------+-----------------------------------
                                  Total |     17,875      100.00
 
. use "C:\Documents and Settings\aksd\stata1\2002\dataset2002.dta", clear
 
. ta literacy
      liter |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,670       30.64       30.64
          2 |      1,450        5.79       36.43
          3 |     15,912       63.57      100.00
------------+-----------------------------------
      Total |     25,032      100.00
 

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