Frequencies for first 10,000 rows of leftbtri variable in nhamcsed2014 dataset :

Left before |
     triage |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,980       99.80       99.80
        Yes |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017