Frequencies for a_c1_31 variable in snf_rollup2540_96_1997 dataset :

    a_c1_31 |      Freq.     Percent        Cum.
------------+-----------------------------------
        494 |          1        0.01        0.01
       1354 |          1        0.01        0.02
       3226 |          1        0.01        0.03
       4866 |          1        0.01        0.03
       6140 |          1        0.01        0.04
       9467 |          1        0.01        0.05
       9822 |          1        0.01        0.06
      11593 |          1        0.01        0.07
      16517 |          1        0.01        0.08
      20935 |          1        0.01        0.08
      23960 |          1        0.01        0.09
      42979 |          1        0.01        0.10
      48604 |          1        0.01        0.11
     102692 |          1        0.01        0.12
     132219 |          1        0.01        0.13
     174268 |          1        0.01        0.13
     183351 |          1        0.01        0.14
          . |     11,901       99.86      100.00
------------+-----------------------------------
      Total |     11,918      100.00

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