Frequencies for first 10,000 rows of mdcl_schl_afltn_cd variable in pos2000 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,871       88.71       88.71
          1 |         70        0.70       89.41
          2 |        100        1.00       90.41
          3 |         34        0.34       90.75
          4 |        925        9.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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