Frequencies for first 10,000 rows of excision variable in namcs2015 dataset :

Excision of |
     tissue |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,722       97.22       97.22
          1 |        278        2.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017