Frequencies for first 10,000 rows of prov2295 variable in pos1993 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |        983        9.83       98.39
          1 |         89        0.89       99.28
          2 |         64        0.64       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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