Frequencies for first 10,000 rows of drg6ing2 variable in nhamcsed2005 dataset :

                             ing. #2 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                          butalbital |          2        0.02        0.02
                         niacinamide |          1        0.01        0.03
                        promethazine |          1        0.01        0.04
                     scopolamine hbr |          1        0.01        0.05
                         soybean oil |          1        0.01        0.06
                      tetanus toxoid |          1        0.01        0.07
                         triamterene |          1        0.01        0.08
                        trimethoprim |          5        0.05        0.13
                           vitamin c |          1        0.01        0.14
                          salmeterol |          2        0.02        0.16
                 magnesium hydroxide |          2        0.02        0.18
              propoxyphene napsylate |          1        0.01        0.19
                            molasses |          1        0.01        0.20
              hydrocodone bitartrate |         23        0.23        0.43
                   codeine phosphate |          1        0.01        0.44
                   ampicillin sodium |          1        0.01        0.45
                       oxycodone hcl |          7        0.07        0.52
               clavulanate potassium |          3        0.03        0.55
               phenylephrine tannate |          1        0.01        0.56
                  losartan potassium |          1        0.01        0.57
                   tazobactam sodium |          1        0.01        0.58
                                   . |      9,942       99.42      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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