Frequencies for first 10,000 rows of wttake variable in nhamcsopd2007 dataset :

     weight |
      taken |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      3,604       36.04       36.04
        yes |      6,396       63.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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