Frequencies for b_1_c0_4501 variable in hcris2552_10_2013 dataset :

        icf |
    b000001 |
04501 00000 |      Freq.     Percent        Cum.
------------+-----------------------------------
    1388124 |          1        0.02        0.02
    2019858 |          1        0.02        0.03
   2.01e+07 |          1        0.02        0.05
          . |      6,245       99.95      100.00
------------+-----------------------------------
      Total |      6,248      100.00

by Jean Roth , jroth@nber.org , 23 Aug 2018