Frequencies for first 10,000 rows of prov2100 variable in pos1997 dataset :

       srv: |
chiropracti |
          c |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |      1,169       11.69       99.61
          1 |         16        0.16       99.77
          2 |         19        0.19       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016