Frequencies for first 10,000 rows of prov2195 variable in pos2002 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,505       85.05       85.05
          0 |      1,469       14.69       99.74
          1 |          8        0.08       99.82
          2 |         17        0.17       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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