Frequencies for first 10,000 rows of drg6ing2 variable in nhamcsed2003 dataset :

  ingredient code #2 for medication |
                                 #6 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                         butalbital |          1        0.01        0.01
                      phenobarbital |          1        0.01        0.02
                         pyridoxine |          1        0.01        0.03
                     tetanus toxoid |          1        0.01        0.04
                       trimethoprim |          2        0.02        0.06
                          vitamin c |          1        0.01        0.07
                         salmeterol |          1        0.01        0.08
                magnesium hydroxide |          2        0.02        0.10
             propoxyphene napsylate |          1        0.01        0.11
             hydrocodone bitartrate |         21        0.21        0.32
                  codeine phosphate |          2        0.02        0.34
                      oxycodone hcl |          5        0.05        0.39
                       tramadol hcl |          2        0.02        0.41
               chlordiazepoxide hcl |          1        0.01        0.42
                  albuterol sulfate |          1        0.01        0.43
                      verapamil hcl |          1        0.01        0.44
                                  . |      9,956       99.56      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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