Frequencies for first 10,000 rows of chrprctic_srvc_cd variable in pos2010 dataset :

       SRV: |
CHIROPRACTI |
          C |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,327       13.27       99.53
          1 |         20        0.20       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