Frequencies for a_c6_55 variable in snf_rollup2540_96_1996 dataset :

    a_c6_55 |      Freq.     Percent        Cum.
------------+-----------------------------------
    -307168 |          1        0.01        0.01
     -66059 |          1        0.01        0.02
      -3620 |          1        0.01        0.03
         -6 |          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