Frequencies for first 10,000 rows of prescr5 variable in namcs2006 dataset :

            for rx5, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      1,437       14.37       14.37
nonprescription drug |        172        1.72       16.09
        undetermined |        103        1.03       17.12
                   . |      8,288       82.88      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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