Frequencies for s5_c4_4 variable in hcris2552_10_2015 dataset :

       capd |
  exchanges |
    per day |
    s500000 |
00400 00400 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.03        0.03
          2 |          2        0.03        0.06
          3 |          2        0.03        0.10
          4 |         17        0.27        0.37
          5 |          1        0.02        0.38
          7 |          2        0.03        0.42
         12 |          1        0.02        0.43
         16 |          1        0.02        0.45
         47 |          1        0.02        0.46
          . |      6,229       99.54      100.00
------------+-----------------------------------
      Total |      6,258      100.00

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