Frequencies for first 10,000 rows of prov2295 variable in pos1997 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |      1,049       10.49       98.41
          1 |         88        0.88       99.29
          2 |         64        0.64       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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