Frequencies for first 10,000 rows of bonedens variable in namcs2006 dataset :

       bone |
    mineral |
    density |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,965       99.65       99.65
        yes |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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