Frequencies for first 10,000 rows of mdcl_schl_afltn_cd variable in pos2003 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          1 |         75        0.75       88.64
          2 |        102        1.02       89.66
          3 |         36        0.36       90.02
          4 |        998        9.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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