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

   left ama |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,880       98.80       98.80
        yes |        120        1.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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