Frequencies for first 10,000 rows of prov2295 variable in pos1991 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,770       87.70       87.70
          0 |      1,091       10.91       98.61
          1 |         81        0.81       99.42
          2 |         51        0.51       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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