Frequencies for first 10,000 rows of leftamse variable in nhamcsed2007 dataset :

 left after |
    medical |
  screening |
       exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,888       98.88       98.88
        yes |        112        1.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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