Frequencies for first 10,000 rows of prov3495 variable in pos2009 dataset :

       SRV: |
   CLINICAL |
LAB-OFFSITE |
  -RESIDENT |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,657       76.57       76.57
          N |      1,750       17.50       94.07
          Y |        593        5.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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