Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2004 dataset :

 prescription status |
 code for medication |
                  #4 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      1,407       14.07       14.07
nonprescription drug |        259        2.59       16.66
        undetermined |        139        1.39       18.05
                   . |      8,195       81.95      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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