Frequencies for first 10,000 rows of prescr1 variable in namcs2006 dataset :

            for rx1, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      6,479       64.79       64.79
nonprescription drug |        543        5.43       70.22
        undetermined |        542        5.42       75.64
                   . |      2,436       24.36      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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