Frequencies for first 10,000 rows of substab variable in nhamcsed2014 dataset :

       Does |
    patient |
      have: |
  Substance |
      abuse |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,343       93.43       93.43
        Yes |        657        6.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017