Frequencies for first 10,000 rows of i_f_code_num variable in demo2006q1 dataset :

   Code for |
 initial or |
  follow-up |
  status of |
 report, as |
   reported |      Freq.     Percent        Cum.
------------+-----------------------------------
F Follow-up |      4,396       43.96       43.96
  I Initial |      5,603       56.03       99.99
          . |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015