Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2008 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,231       92.31       92.31
          1 |        526        5.26       97.57
          2 |        161        1.61       99.18
          3 |         82        0.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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