Frequencies for first 10,000 rows of wttake variable in namcs2005 dataset :

     weight |
      taken |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,976       19.76       19.76
          1 |      8,024       80.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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