Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2004 dataset :

 prescription status |
 code for medication |
                  #2 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      3,883       38.83       38.83
nonprescription drug |        720        7.20       46.03
        undetermined |        491        4.91       50.94
                   . |      4,906       49.06      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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