Frequencies for first 10,000 rows of drg4ing3 variable in nhamcsopd2003 dataset : ingredient code #3 for medication | #4 | Freq. Percent Cum. ------------------------------------+----------------------------------- caffeine | 3 0.03 0.03 isometheptene mucate | 1 0.01 0.04 phenylephrine | 1 0.01 0.05 potassium replacement solutions | 3 0.03 0.08 riboflavin | 7 0.07 0.15 rubella virus vaccine | 4 0.04 0.19 starch | 1 0.01 0.20 tetanus toxoid | 1 0.01 0.21 vitamin k | 1 0.01 0.22 vitamin b | 1 0.01 0.23 vitamin b complex | 1 0.01 0.24 protease | 1 0.01 0.25 dextroamphetamine saccharate | 1 0.01 0.26 manganese ascorbate | 1 0.01 0.27 dextromethorphan hbr | 1 0.01 0.28 pyrilamine tannate | 2 0.02 0.30 oxycodone terephthalate | 1 0.01 0.31 butyl aminobenzoate | 1 0.01 0.32 tetanus vaccine | 4 0.04 0.36 . | 9,964 99.64 100.00 ------------------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016