Frequencies for first 10,000 rows of prov0645 variable in pos2004 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          1 |         75        0.75       88.41
          2 |        105        1.05       89.46
          3 |         34        0.34       89.80
          4 |      1,020       10.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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