Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2006 dataset :

            for rx7, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        103        1.03        1.03
nonprescription drug |          8        0.08        1.11
        undetermined |          4        0.04        1.15
                   . |      9,885       98.85      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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