Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2003 dataset :

 prescription status |
 code for medication |
                  #6 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        414        4.14        4.14
nonprescription drug |         72        0.72        4.86
        undetermined |         57        0.57        5.43
                   . |      9,457       94.57      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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