Frequencies for first 10,000 rows of prescr5 variable in nhamcsed2005 dataset :

 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        553        5.53        5.53
nonprescription drug |         92        0.92        6.45
        undetermined |         62        0.62        7.07
                   . |      9,293       92.93      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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