Frequencies for first 10,000 rows of ume_vac variable in natl2014 dataset :

   Vacuum 1 |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        238        2.38        2.38
          2 |      9,755       97.55       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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