Frequencies for first 10,000 rows of prescr5 variable in nhamcsed2004 dataset :

 prescription status |
 code for medication |
                  #5 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        850        8.50        8.50
nonprescription drug |        144        1.44        9.94
        undetermined |         90        0.90       10.84
                   . |      8,916       89.16      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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