Frequencies for first 10,000 rows of mdcl_schl_afltn_cd variable in pos2005 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          1 |         73        0.73       88.04
          2 |        108        1.08       89.12
          3 |         33        0.33       89.45
          4 |      1,055       10.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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