Frequencies for first 10,000 rows of prov2195 variable in pos2004 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,384       83.84       83.84
          0 |      1,586       15.86       99.70
          1 |          6        0.06       99.76
          2 |         19        0.19       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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