Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd2004 dataset :

 prescription status |
 code for medication |
                  #2 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      3,187       31.87       31.87
nonprescription drug |        682        6.82       38.69
        undetermined |        317        3.17       41.86
                   . |      5,814       58.14      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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