Frequencies for first 10,000 rows of excision variable in nhamcsopd2011 dataset :

Excision of |
     tissue |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,776       97.76       97.76
        Yes |        224        2.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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