Frequencies for first 10,000 rows of intrn_rsdnt_srvc_cd variable in pos2008 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,105       81.05       81.05
          0 |      1,860       18.60       99.65
          1 |         11        0.11       99.76
          2 |         23        0.23       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017