Frequencies for first 10,000 rows of mdcl_schl_afltn_cd variable in pos2008 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,666       86.66       86.66
          1 |         71        0.71       87.37
          2 |        116        1.16       88.53
          3 |         36        0.36       88.89
          4 |      1,111       11.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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