Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2004 dataset :

 prescription status |
 code for medication |
                  #1 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      5,631       56.31       56.31
nonprescription drug |      1,173       11.73       68.04
        undetermined |        850        8.50       76.54
                   . |      2,346       23.46      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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