Frequencies for first 10,000 rows of ngtube variable in nhamcsed2002 dataset :

         ng |
tube/gastri |
   c lavage |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,968       99.68       99.68
          1 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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