Frequencies for first 10,000 rows of drg4ing3 variable in nhamcsed2004 dataset :

  ingredient code #3 for medication |
                                 #4 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                           caffeine |          1        0.01        0.01
                          lidocaine |          1        0.01        0.02
                 magnesium antacids |          2        0.02        0.04
                    phenolphthalein |          1        0.01        0.05
                phenylpropanolamine |          1        0.01        0.06
                         pyridoxine |          1        0.01        0.07
                         riboflavin |          6        0.06        0.13
                    scopolamine hbr |          2        0.02        0.15
              sodium lauryl sulfate |          1        0.01        0.16
                       theophylline |          1        0.01        0.17
                          vitamin b |          1        0.01        0.18
                  vitamin b complex |          1        0.01        0.19
                   atropine sulfate |         14        0.14        0.33
                polymyxin b sulfate |          1        0.01        0.34
               dextromethorphan hbr |          1        0.01        0.35
                   neomycin sulfate |          1        0.01        0.36
                                  . |      9,964       99.64      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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