Frequencies for first 10,000 rows of bonedens variable in nhamcsopd2005 dataset :

       bone |
    mineral |
    density |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,949       99.49       99.49
        yes |         51        0.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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