Frequencies for first 10,000 rows of hyperac variable in namcs1996 dataset :

       does |
    patient |
     have - |
hyperactivi |
     ty/add |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,888       98.88       98.88
          1 |        112        1.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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