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

   Left AMA |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,892       98.92       98.92
        Yes |        108        1.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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