Frequencies for first 10,000 rows of optmtrc_srvc_cd variable in pos2018 dataset :

  Services: |
 Optometric |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,560       85.60       85.60
          0 |      1,263       12.63       98.23
          1 |         82        0.82       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 , 15 Feb 2019