Frequencies for first 10,000 rows of drug8cl2 variable in nhamcsed2005 dataset :

          ndc code #2 for medication #8 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                          beta blockers |          1        0.01        0.01
        antispasmodics/anticholinergics |          1        0.01        0.02
                cycloplegics/mydriatics |          1        0.01        0.03
       vertigo/motion sickness/vomiting |          3        0.03        0.06
                           antipyretics |          5        0.05        0.11
                                      . |      9,989       99.89      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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