Frequencies for first 10,000 rows of prescr8 variable in nhamcsed2004 dataset :

 prescription status |
 code for medication |
                  #8 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        272        2.72        2.72
nonprescription drug |         61        0.61        3.33
        undetermined |         18        0.18        3.51
                   . |      9,649       96.49      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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