Frequencies for first 10,000 rows of prov2195 variable in pos1993 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,870       88.70       88.70
          0 |      1,106       11.06       99.76
          1 |          6        0.06       99.82
          2 |         16        0.16       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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