Frequencies for first 10,000 rows of prov2295 variable in pos2004 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |      1,091       10.91       98.57
          1 |         73        0.73       99.30
          2 |         61        0.61       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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