Frequencies for first 10,000 rows of optmtrc_srvc_cd variable in pos2000 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,871       88.71       88.71
          0 |        996        9.96       98.67
          1 |         75        0.75       99.42
          2 |         52        0.52       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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