Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2005 dataset :

 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        167        1.67        1.67
nonprescription drug |         18        0.18        1.85
        undetermined |         10        0.10        1.95
                   . |      9,805       98.05      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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