Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd2004 dataset :

 prescription status |
 code for medication |
                  #1 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      4,888       48.88       48.88
nonprescription drug |      1,099       10.99       59.87
        undetermined |        493        4.93       64.80
                   . |      3,520       35.20      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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