Frequencies for first 10,000 rows of prov2195 variable in pos1998 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,591       85.91       85.91
          0 |      1,384       13.84       99.75
          1 |          9        0.09       99.84
          2 |         15        0.15       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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