Frequencies for first 10,000 rows of prov2295 variable in pos1999 dataset :

       srv: |
 optometric |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,885       88.85       88.85
          0 |        979        9.79       98.64
          1 |         76        0.76       99.40
          2 |         55        0.55       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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