Frequencies for first 10,000 rows of prescr8 variable in nhamcsed2003 dataset :

 prescription status |
 code for medication |
                  #8 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        174        1.74        1.74
nonprescription drug |         31        0.31        2.05
        undetermined |         18        0.18        2.23
                   . |      9,777       97.77      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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