Frequencies for first 10,000 rows of i_f_code_num variable in demo2005q1 dataset :

   Code for |
 initial or |
  follow-up |
  status of |
 report, as |
   reported |      Freq.     Percent        Cum.
------------+-----------------------------------
F Follow-up |      2,690       26.90       26.90
  I Initial |      7,308       73.08       99.98
          . |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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