Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd2004 dataset :

 prescription status |
 code for medication |
                  #3 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      2,150       21.50       21.50
nonprescription drug |        332        3.32       24.82
        undetermined |        202        2.02       26.84
                   . |      7,316       73.16      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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