Frequencies for first 10,000 rows of prov3485 variable in pos1999 dataset :

       srv: |
   clinical |
lab-onsite- |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,387       73.87       73.87
          N |        516        5.16       79.03
          Y |      2,097       20.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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