Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2006 dataset :

            for rx2, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      3,564       35.64       35.64
nonprescription drug |        713        7.13       42.77
        undetermined |        562        5.62       48.39
                   . |      5,161       51.61      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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