Frequencies for s5_c4_6 variable in hcris2552_10_2014 dataset :

  number of |
   stations |
    s500000 |
00600 00400 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         12        0.19        0.19
          2 |          6        0.10        0.29
          3 |          5        0.08        0.37
          4 |          2        0.03        0.40
          5 |          2        0.03        0.43
          6 |          1        0.02        0.45
          7 |          1        0.02        0.46
          8 |          1        0.02        0.48
         31 |          1        0.02        0.50
          . |      6,217       99.50      100.00
------------+-----------------------------------
      Total |      6,248      100.00

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