Frequencies for first 10,000 rows of revision variable in natlterr2010 dataset :

   Revision |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          A |      5,344       53.44       53.44
          S |      4,656       46.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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