Frequencies for first 10,000 rows of prov2195 variable in pos2006 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,263       82.63       82.63
          0 |      1,707       17.07       99.70
          1 |          7        0.07       99.77
          2 |         19        0.19       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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