Frequencies for first 10,000 rows of prov3485 variable in pos2001 dataset :

       srv: |
   clinical |
lab-onsite- |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,345       73.45       73.45
          N |        493        4.93       78.38
          Y |      2,162       21.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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