Frequencies for first 10,000 rows of prov2295 variable in pos1998 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |      1,043       10.43       98.48
          1 |         85        0.85       99.33
          2 |         61        0.61       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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