Frequencies for first 10,000 rows of revision variable in natlterr2007 dataset :

   Revision |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          A |      3,837       38.37       38.37
          S |      6,163       61.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015