Frequencies for b_1_c18_5020 variable in snf_rollup2540_96_1996 dataset :

b_1_c18_502 |
          0 |      Freq.     Percent        Cum.
------------+-----------------------------------
         40 |          1        0.01        0.01
        225 |          1        0.01        0.02
       1218 |          1        0.01        0.03
       3648 |          1        0.01        0.04
          . |      9,604       99.96      100.00
------------+-----------------------------------
      Total |      9,608      100.00

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