Frequencies for first 10,000 rows of mdcl_schl_afltn_cd variable in pos2016 dataset :

    Medical |
     School |
Affiliation |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,579       85.79       85.79
          1 |         79        0.79       86.58
          2 |        117        1.17       87.75
          3 |         36        0.36       88.11
          4 |      1,189       11.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Jan 2017