Frequencies for first 10,000 rows of optmtrc_srvc_cd variable in pos2003 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |      1,071       10.71       98.60
          1 |         73        0.73       99.33
          2 |         59        0.59       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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