Frequencies for first 10,000 rows of prov2195 variable in pos1991 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,733       87.33       87.33
          0 |      1,245       12.45       99.78
          1 |          9        0.09       99.87
          2 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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