Frequencies for s5_c4_6 variable in hcris2552_10_2015 dataset :

  number of |
   stations |
    s500000 |
00600 00400 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         14        0.22        0.22
          2 |          6        0.10        0.32
          3 |          3        0.05        0.37
          4 |          4        0.06        0.43
          5 |          1        0.02        0.45
          6 |          1        0.02        0.46
          7 |          1        0.02        0.48
          . |      6,228       99.52      100.00
------------+-----------------------------------
      Total |      6,258      100.00

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