Frequencies for first 10,000 rows of prov2100 variable in pos1995 dataset :

       srv: |
chiropracti |
          c |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          0 |      1,032       10.32       99.65
          1 |         13        0.13       99.78
          2 |         20        0.20       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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