Frequencies for first 10,000 rows of prov2295 variable in pos2002 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,812       88.12       88.12
          0 |      1,053       10.53       98.65
          1 |         72        0.72       99.37
          2 |         56        0.56       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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