Frequencies for first 10,000 rows of mdcl_schl_afltn_cd variable in pos1994 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          1 |         66        0.66       90.06
          2 |         89        0.89       90.95
          3 |         34        0.34       91.29
          4 |        871        8.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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