Frequencies for first 10,000 rows of optmtrc_srvc_cd variable in pos2011 dataset :

   Services |
  Provided: |
 Optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,614       86.14       86.14
          0 |      1,236       12.36       98.50
          1 |         79        0.79       99.29
          2 |         59        0.59       99.88
          3 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Apr 2019