Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2007 dataset :

            for rx6, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        394        3.94        3.94
nonprescription drug |         55        0.55        4.49
        undetermined |         14        0.14        4.63
                   . |      9,537       95.37      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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