Frequencies for first 10,000 rows of prescr7 variable in nhamcsopd2008 dataset :

            for rx7, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        929        9.29        9.29
nonprescription drug |         63        0.63        9.92
        undetermined |         36        0.36       10.28
                   5 |        193        1.93       12.21
                   . |      8,779       87.79      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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