Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2016 dataset :

  Services: |
  Physician |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      9,274       92.74       92.74
          1 |        464        4.64       97.38
          2 |        246        2.46       99.84
          3 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Jan 2017