Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2003 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,384       93.84       93.84
          1 |        454        4.54       98.38
          2 |        101        1.01       99.39
          3 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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