Frequencies for first 10,000 rows of prescr5 variable in namcs2007 dataset :

 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      1,570       15.70       15.70
nonprescription drug |        132        1.32       17.02
        undetermined |         67        0.67       17.69
                   . |      8,231       82.31      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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