Frequencies for s5_c3_6 variable in hcris2552_10_2010 dataset :

  number of |
   stations |
    s500000 |
00600 00300 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.13        0.13
          2 |          1        0.04        0.17
          3 |          1        0.04        0.22
          4 |          1        0.04        0.26
          5 |          1        0.04        0.30
          6 |          1        0.04        0.34
         26 |          1        0.04        0.39
          . |      2,313       99.61      100.00
------------+-----------------------------------
      Total |      2,322      100.00

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