Frequencies for first 10,000 rows of chrprctic_srvc_cd variable in pos2009 dataset :

       SRV: |
CHIROPRACTI |
          C |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |      1,314       13.14       99.52
          1 |         21        0.21       99.73
          2 |         24        0.24       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017