Frequencies for first 10,000 rows of prov3485 variable in pos1997 dataset :

       srv: |
   clinical |
lab-onsite- |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,410       74.10       74.10
          N |        510        5.10       79.20
          Y |      2,080       20.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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