Frequencies for s5_c4_4 variable in hcris2552_10_2017 dataset :

       capd |
  exchanges |
    per day |
    s500000 |
00400 00400 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.08        0.08
          2 |          2        0.05        0.13
          3 |          1        0.03        0.16
          4 |          6        0.16        0.32
          5 |          1        0.03        0.35
        6.5 |          1        0.03        0.37
          7 |          1        0.03        0.40
         12 |          1        0.03        0.43
          . |      3,733       99.57      100.00
------------+-----------------------------------
      Total |      3,749      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2018