Frequencies for first 10,000 rows of prov2960 variable in pos1992 dataset :

    medical |
physicist-d |
      irect |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,990       99.90       99.90
         .1 |          1        0.01       99.91
          1 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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