Frequencies for first 10,000 rows of leftbtri variable in nhamcsed2013 dataset :

Left before |
     triage |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,971       99.71       99.71
        Yes |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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