Frequencies for first 10,000 rows of prov3485 variable in pos1998 dataset :

       srv: |
   clinical |
lab-onsite- |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,422       74.22       74.22
          N |        503        5.03       79.25
          Y |      2,075       20.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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