Frequencies for first 10,000 rows of prov2100 variable in pos1998 dataset :

       srv: |
chiropracti |
          c |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |      1,158       11.58       99.63
          1 |         14        0.14       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