Frequencies for first 10,000 rows of prov2100 variable in pos1993 dataset :

       srv: |
chiropracti |
          c |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |      1,110       11.10       99.66
          1 |         14        0.14       99.80
          2 |         15        0.15       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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