Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd2004 dataset :

 prescription status |
 code for medication |
                  #5 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      1,098       10.98       10.98
nonprescription drug |        169        1.69       12.67
        undetermined |        102        1.02       13.69
                   . |      8,631       86.31      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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