Frequencies for first 10,000 rows of prescr8 variable in nhamcsed2007 dataset :

            for rx8, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        124        1.24        1.24
nonprescription drug |         18        0.18        1.42
        undetermined |          4        0.04        1.46
                   . |      9,854       98.54      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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