Frequencies for first 10,000 rows of mdcl_schl_afltn_cd variable in pos2010 dataset :

    MEDICAL |
     SCHOOL |
AFFILIATION |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          1 |         73        0.73       87.11
          2 |        119        1.19       88.30
          3 |         35        0.35       88.65
          4 |      1,135       11.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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