Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2006 dataset :

            for rx6, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        194        1.94        1.94
nonprescription drug |         33        0.33        2.27
        undetermined |         13        0.13        2.40
                   . |      9,760       97.60      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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