Frequencies for first 10,000 rows of prov0645 variable in pos1997 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          1 |         73        0.73       88.65
          2 |        112        1.12       89.77
          3 |         45        0.45       90.22
          4 |        978        9.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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