Frequencies for first 10,000 rows of prov0645 variable in pos1999 dataset :

    medical |
     school |
affiliation |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,885       88.85       88.85
          1 |         69        0.69       89.54
          2 |         98        0.98       90.52
          3 |         31        0.31       90.83
          4 |        917        9.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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