Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd2003 dataset :

 prescription status |
 code for medication |
                  #3 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      2,085       20.85       20.85
nonprescription drug |        258        2.58       23.43
        undetermined |        177        1.77       25.20
                   . |      7,480       74.80      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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