Frequencies for first 10,000 rows of drug7cl2 variable in nhamcsed2005 dataset :

          ndc code #2 for medication #7 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        medicinal gases |          1        0.01        0.01
                          beta blockers |          2        0.02        0.03
        antispasmodics/anticholinergics |          1        0.01        0.04
                      vitamins/minerals |          1        0.01        0.05
          skeletal muscle hyperactivity |          1        0.01        0.06
              miscellaneous ophthalmics |          1        0.01        0.07
       vertigo/motion sickness/vomiting |          4        0.04        0.11
                         antiarthritics |          2        0.02        0.13
                           antipyretics |          4        0.04        0.17
                                      . |      9,983       99.83      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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