Frequencies for first 10,000 rows of intrn_rsdnt_srvc_cd variable in pos2018 dataset :

  Services: |
Interns and |
  Residents |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,921       89.21       89.21
          0 |      1,068       10.68       99.89
          1 |          2        0.02       99.91
          2 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019