Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2003 dataset :

 prescription status |
 code for medication |
                  #2 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      3,690       36.90       36.90
nonprescription drug |        763        7.63       44.53
        undetermined |        535        5.35       49.88
                   . |      5,012       50.12      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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