Frequencies for first 10,000 rows of prov3280 variable in pos2009 dataset :

       SRV: |
PHYSICIAN-O |
  NSITE-NON |
   RESIDENT |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,657       76.57       76.57
          N |      2,285       22.85       99.42
          Y |         58        0.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016