Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd2007 dataset :

            for rx1, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      5,617       56.17       56.17
nonprescription drug |      1,001       10.01       66.18
        undetermined |        176        1.76       67.94
             illicit |          1        0.01       67.95
                   . |      3,205       32.05      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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