Frequencies for first 10,000 rows of vitd variable in namcs2014 dataset :

  Vitamin D |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,826       98.26       98.26
        Yes |        174        1.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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