Frequencies for first 10,000 rows of physical variable in namcs2013 dataset :

    General |
   physical |
       exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      4,214       42.14       42.14
        Yes |      5,786       57.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017