Frequencies for s5_c2_7 variable in hcris2552_10_2010 dataset :

    station |
    s500000 |
00700 00200 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.04        0.04
          2 |         10        0.43        0.47
          3 |         25        1.08        1.55
          4 |          1        0.04        1.59
          6 |          1        0.04        1.64
          7 |          1        0.04        1.68
         18 |          1        0.04        1.72
         45 |          1        0.04        1.77
        312 |          1        0.04        1.81
          . |      2,280       98.19      100.00
------------+-----------------------------------
      Total |      2,322      100.00

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