Frequencies for first 10,000 rows of physn_srvc_cd variable in pos1998 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,500       95.00       95.00
          1 |        446        4.46       99.46
          2 |         21        0.21       99.67
          3 |         33        0.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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