Frequencies for first 10,000 rows of drg4ing3 variable in nhamcsed2003 dataset :

  ingredient code #3 for medication |
                                 #4 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                           caffeine |          4        0.04        0.04
                     dihydrocodeine |          1        0.01        0.05
                 magnesium antacids |          1        0.01        0.06
                phenylpropanolamine |          2        0.02        0.08
                         riboflavin |          1        0.01        0.09
                             starch |          2        0.02        0.11
                   atropine sulfate |          5        0.05        0.16
                pseudoephedrine hcl |          1        0.01        0.17
                  phenylephrine hcl |          1        0.01        0.18
                   neomycin sulfate |          1        0.01        0.19
               orphenadrine citrate |          1        0.01        0.20
                                  . |      9,980       99.80      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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