Frequencies for first 10,000 rows of ume_vac variable in natlterr2014 dataset :

   Vacuum 1 |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         85        0.85        0.85
          2 |      8,678       86.78       87.63
          9 |      1,237       12.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016