Frequencies for first 10,000 rows of prov2100 variable in pos2006 dataset :

       srv: |
chiropracti |
          c |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |      1,246       12.46       99.56
          1 |         18        0.18       99.74
          2 |         22        0.22       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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