Frequencies for first 10,000 rows of drg7ing4 variable in nhamcsopd2005 dataset :

ingredient code #4 for medication #7 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                          petrolatum |          1        0.01        0.01
                            thiamine |          1        0.01        0.02
                        zinc chelate |          1        0.01        0.03
                         lanolin oil |          1        0.01        0.04
                                   . |      9,996       99.96      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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