Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2007 dataset :

            for rx7, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        232        2.32        2.32
nonprescription drug |         37        0.37        2.69
        undetermined |          3        0.03        2.72
                   . |      9,728       97.28      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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