Frequencies for first 10,000 rows of prov6220 variable in pos2007 dataset :

       srv: |
  opthalmic |
    surgery |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |      1,241       12.41       99.23
          1 |         61        0.61       99.84
          2 |          9        0.09       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017