Frequencies for first 10,000 rows of prov0645 variable in pos2001 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          1 |         72        0.72       89.09
          2 |        101        1.01       90.10
          3 |         32        0.32       90.42
          4 |        958        9.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016