Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd2008 dataset :

            for rx6, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      1,231       12.31       12.31
nonprescription drug |         69        0.69       13.00
        undetermined |         37        0.37       13.37
                   5 |        267        2.67       16.04
                   . |      8,396       83.96      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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