Frequencies for first 10,000 rows of revision variable in natlterr2008 dataset :

   Revision |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          A |      3,939       39.39       39.39
          S |      6,061       60.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016