Frequencies for first 10,000 rows of prov2100 variable in pos2004 dataset :

       srv: |
chiropracti |
          c |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |      1,197       11.97       99.63
          1 |         13        0.13       99.76
          2 |         21        0.21       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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