Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd2005 dataset :

 prescription status |
     code for med #6 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        674        6.74        6.74
nonprescription drug |        119        1.19        7.93
        undetermined |         57        0.57        8.50
                   . |      9,150       91.50      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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