Frequencies for first 10,000 rows of prov2295 variable in pos2001 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          0 |      1,028       10.28       98.65
          1 |         75        0.75       99.40
          2 |         54        0.54       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016