Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd2008 dataset :

            for rx3, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      2,785       27.85       27.85
nonprescription drug |        137        1.37       29.22
        undetermined |         73        0.73       29.95
                   5 |        566        5.66       35.61
                   . |      6,439       64.39      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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