Frequencies for first 10,000 rows of leftbtri variable in nhamcsed2011 dataset :

Left before |
     triage |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,964       99.64       99.64
        Yes |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016