Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd2008 dataset :

            for rx1, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      5,431       54.31       54.31
nonprescription drug |        572        5.72       60.03
        undetermined |        178        1.78       61.81
                   5 |        918        9.18       70.99
                   . |      2,901       29.01      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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