Frequencies for spec_ind variable in hcris2552_10_2012 dataset :

    special |
  indicator |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,130       98.44       98.44
          F |         97        1.56      100.00
------------+-----------------------------------
      Total |      6,227      100.00

by Jean Roth , jroth@nber.org , 23 Aug 2018