Frequencies for first 10,000 rows of intrn_rsdnt_srvc_cd variable in pos1992 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,768       87.68       87.68
          0 |      1,209       12.09       99.77
          1 |          7        0.07       99.84
          2 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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