Frequencies for first 10,000 rows of optmtrc_srvc_cd variable in pos2016 dataset :

  Services: |
 Optometric |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,569       85.69       85.69
          0 |      1,259       12.59       98.28
          1 |         77        0.77       99.05
          2 |         78        0.78       99.83
          3 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Jan 2017