Frequencies for first 10,000 rows of hyperac variable in nhamcsopd1996 dataset :

       does |
    patient |
     have - |
hyperactivi |
     ty/add |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,896       98.96       98.96
          1 |        104        1.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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