Frequencies for first 10,000 rows of ume_vac variable in natl2017 dataset :

   Vacuum 1 |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018