Frequencies for first 10,000 rows of prov0645 variable in pos1993 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          1 |         68        0.68       89.24
          2 |         94        0.94       90.18
          3 |         43        0.43       90.61
          4 |        939        9.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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