Frequencies for first 10,000 rows of prov0645 variable in pos1992 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,851       88.51       88.51
          1 |         70        0.70       89.21
          2 |         89        0.89       90.10
          3 |         50        0.50       90.60
          4 |        940        9.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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