Frequencies for first 10,000 rows of drg2ing5 variable in nhamcsed2005 dataset :

                             ing. #5 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   phenyl salicylate |          1        0.01        0.01
                          sodium ion |          4        0.04        0.05
                            thiamine |          2        0.02        0.07
                           vitamin a |          3        0.03        0.10
                 hyoscyamine sulfate |          1        0.01        0.11
                    neomycin sulfate |          5        0.05        0.16
                    propoxycaine hcl |          1        0.01        0.17
                                   . |      9,983       99.83      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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