Frequencies for first 10,000 rows of opthlmc_srgy_srvc_cd variable in pos2018 dataset :

  Services: |
 Ophthalmic |
    Surgery |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,560       85.60       85.60
          0 |      1,119       11.19       96.79
          1 |        231        2.31       99.10
          2 |         38        0.38       99.48
          3 |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019