Frequencies for b_1_c18_13 variable in snf_rollup2540_96_1996 dataset :

 b_1_c18_13 |      Freq.     Percent        Cum.
------------+-----------------------------------
     233516 |          1        0.01        0.01
          . |      9,607       99.99      100.00
------------+-----------------------------------
      Total |      9,608      100.00

by Jean Roth , jroth@nber.org , 17 Feb 2018