Frequencies for a_c2_55 variable in snf_rollup2540_96_2011 dataset :

    a_c2_55 |      Freq.     Percent        Cum.
------------+-----------------------------------
     211399 |          1        0.06        0.06
     238868 |          1        0.06        0.11
     264535 |          1        0.06        0.17
    1204378 |          1        0.06        0.22
          . |      1,805       99.78      100.00
------------+-----------------------------------
      Total |      1,809      100.00

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