Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2007 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,248       92.48       92.48
          1 |        521        5.21       97.69
          2 |        147        1.47       99.16
          3 |         84        0.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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