Frequencies for first 10,000 rows of opthlmc_srgy_srvc_cd variable in pos2012 d

   Services |
  Provided: |
 Ophthalmic |
    Surgery |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,606       86.06       86.06
          0 |      1,172       11.72       97.78
          1 |        170        1.70       99.48
          2 |         29        0.29       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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