Frequencies for first 10,000 rows of prescr5 variable in nhamcsed2007 dataset :

            for rx5, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        715        7.15        7.15
nonprescription drug |        122        1.22        8.37
        undetermined |         20        0.20        8.57
                   . |      9,143       91.43      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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