Frequencies for s5_c2_7 variable in hcris2552_10_2011 dataset :

    station |
    s500000 |
00700 00200 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         26        0.42        0.42
          3 |         57        0.93        1.35
          4 |         12        0.20        1.54
          9 |          1        0.02        1.56
         24 |          2        0.03        1.59
         90 |          1        0.02        1.61
          . |      6,051       98.39      100.00
------------+-----------------------------------
      Total |      6,150      100.00

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