Frequencies for first 10,000 rows of drg7ing2 variable in nhamcsed2005 dataset :

                             ing. #2 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                              niacin |          1        0.01        0.01
                          pyridoxine |          1        0.01        0.02
                          riboflavin |          1        0.01        0.03
                          salmeterol |          2        0.02        0.05
                  sodium biphosphate |          1        0.01        0.06
                          irbesartan |          1        0.01        0.07
                    atropine sulfate |          1        0.01        0.08
              hydrocodone bitartrate |          7        0.07        0.15
                   codeine phosphate |          1        0.01        0.16
                       oxycodone hcl |          1        0.01        0.17
               clavulanate potassium |          2        0.02        0.19
                   albuterol sulfate |          2        0.02        0.21
                    neomycin sulfate |          1        0.01        0.22
                                   . |      9,978       99.78      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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