Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd2008 dataset :

            for rx4, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      2,083       20.83       20.83
nonprescription drug |        122        1.22       22.05
        undetermined |         76        0.76       22.81
                   5 |        428        4.28       27.09
                   . |      7,291       72.91      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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