Frequencies for first 10,000 rows of vitd variable in namcs2015 dataset :

  Vitamin D |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,851       98.51       98.51
          1 |        149        1.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017