Frequencies for b_1_c18_40 variable in snf_rollup2540_96_1995 dataset :

 b_1_c18_40 |      Freq.     Percent        Cum.
------------+-----------------------------------
         67 |          1        0.08        0.08
        250 |          1        0.08        0.16
        324 |          1        0.08        0.24
        401 |          1        0.08        0.32
        588 |          1        0.08        0.40
       1940 |          1        0.08        0.49
       1962 |          1        0.08        0.57
       3666 |          1        0.08        0.65
       4315 |          1        0.08        0.73
       4747 |          1        0.08        0.81
       4754 |          1        0.08        0.89
       6644 |          1        0.08        0.97
       7016 |          1        0.08        1.05
       7953 |          1        0.08        1.13
      10881 |          1        0.08        1.21
      14110 |          1        0.08        1.30
      17820 |          1        0.08        1.38
      23996 |          1        0.08        1.46
     128032 |          1        0.08        1.54
          . |      1,216       98.46      100.00
------------+-----------------------------------
      Total |      1,235      100.00

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