Frequencies for first 10,000 rows of prescr3 variable in nhamcsed2003 dataset :

 prescription status |
 code for medication |
                  #3 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      2,106       21.06       21.06
nonprescription drug |        404        4.04       25.10
        undetermined |        282        2.82       27.92
                   . |      7,208       72.08      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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