Frequencies for first 10,000 rows of prescr8 variable in nhamcsopd2006 dataset :

            for rx8, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   Prescription drug |        452        4.52        4.52
Nonprescription drug |         77        0.77        5.29
        Undetermined |         51        0.51        5.80
                   . |      9,420       94.20      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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