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

  Services: |
  Physician |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      9,243       92.43       92.43
          1 |        465        4.65       97.08
          2 |        267        2.67       99.75
          3 |         25        0.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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