Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2002 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,429       94.29       94.29
          1 |        444        4.44       98.73
          2 |         72        0.72       99.45
          3 |         55        0.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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