Frequencies for first 10,000 rows of prescr3 variable in nhamcsed2004 dataset :

 prescription status |
 code for medication |
                  #3 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      2,301       23.01       23.01
nonprescription drug |        434        4.34       27.35
        undetermined |        286        2.86       30.21
                   . |      6,979       69.79      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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