Frequencies for first 10,000 rows of leftbtri variable in nhamcsed2012 dataset :

Left before |
     triage |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,973       99.73       99.73
        Yes |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016