Frequencies for first 10,000 rows of prov1300 variable in pos1991 dataset :

 tech super |
    - ba/bs |
   microbio |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,991       99.91       99.91
          1 |          8        0.08       99.99
          2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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