Frequencies for first 10,000 rows of leftama variable in nhamcsed2006 dataset :

   left ama |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,904       99.04       99.04
        yes |         96        0.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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