Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd2006 dataset :

            for rx5, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   Prescription drug |      1,175       11.75       11.75
Nonprescription drug |        162        1.62       13.37
        Undetermined |        105        1.05       14.42
                   . |      8,558       85.58      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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