Frequencies for first 10,000 rows of prov0645 variable in pos2002 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,812       88.12       88.12
          1 |         73        0.73       88.85
          2 |        102        1.02       89.87
          3 |         32        0.32       90.19
          4 |        981        9.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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