Frequencies for first 10,000 rows of ab_aven1 variable in natl2016 dataset :

   Assisted |
Ventilation |
(immediatel |
   y) Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,226       92.26       92.26
          U |         38        0.38       92.64
          Y |        736        7.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017