Frequencies for first 10,000 rows of drug8cl3 variable in nhamcsopd2005 dataset :

          ndc code #3 for medication #8 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
ocular anti-infective/anti-inflammatory |          1        0.01        0.02
                           antipyretics |         16        0.16        0.18
                         antihistamines |          1        0.01        0.19
                          surgical aids |          2        0.02        0.21
                                      . |      9,979       99.79      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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