Frequencies for first 10,000 rows of prescr8 variable in nhamcsopd2007 dataset :

            for rx8, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        735        7.35        7.35
nonprescription drug |         83        0.83        8.18
        undetermined |         26        0.26        8.44
                   . |      9,156       91.56      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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