Frequencies for first 10,000 rows of intrn_rsdnt_srvc_cd variable in pos1994 dataset :

       srv: |
interns and |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,780       87.80       87.80
          0 |      1,196       11.96       99.76
          1 |          7        0.07       99.83
          2 |         14        0.14       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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