Frequencies for first 10,000 rows of intrn_rsdnt_srvc_cd variable in pos2001 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,570       85.70       85.70
          0 |      1,402       14.02       99.72
          1 |         11        0.11       99.83
          2 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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