Frequencies for first 10,000 rows of httake variable in namcs2007 dataset :

     height |
   measured |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      5,100       51.00       51.00
        yes |      4,900       49.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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