Frequencies for a_c1_56 variable in snf_rollup2540_96_2011 dataset :

    a_c1_56 |      Freq.     Percent        Cum.
------------+-----------------------------------
      41877 |          1        0.06        0.06
      84811 |          1        0.06        0.11
          . |      1,807       99.89      100.00
------------+-----------------------------------
      Total |      1,809      100.00

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