Frequencies for first 10,000 rows of wttake variable in nhamcsopd2006 dataset :

     weight |
      taken |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      3,029       30.29       30.29
        Yes |      6,971       69.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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