Frequencies for first 10,000 rows of prov0645 variable in pos1995 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          1 |         64        0.64       89.97
          2 |         94        0.94       90.91
          3 |         31        0.31       91.22
          4 |        878        8.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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