Frequencies for first 10,000 rows of wttake variable in nhamcsopd2008 dataset :

     weight |
      taken |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      2,804       28.04       28.04
        yes |      7,196       71.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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