Frequencies for first 10,000 rows of prov2295 variable in pos1996 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |      1,043       10.43       98.46
          1 |         84        0.84       99.30
          2 |         62        0.62       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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