Frequencies for first 10,000 rows of drg2ing3 variable in nhamcsed2005 dataset : ing. #3 | Freq. Percent Cum. -------------------------------------+----------------------------------- caffeine | 4 0.04 0.04 codeine | 1 0.01 0.05 desoxycholic acid | 1 0.01 0.06 isometheptene mucate | 3 0.03 0.09 magnesium antacids | 4 0.04 0.13 methenamine | 1 0.01 0.14 petrolatum | 1 0.01 0.15 phenyl salicylate | 1 0.01 0.16 procaine | 1 0.01 0.17 pyridoxine | 2 0.02 0.19 riboflavin | 3 0.03 0.22 scopolamine hbr | 3 0.03 0.25 starch | 1 0.01 0.26 tetracaine | 1 0.01 0.27 vitamin c | 1 0.01 0.28 phosphorus | 1 0.01 0.29 polymyxin b | 1 0.01 0.30 atropine sulfate | 13 0.13 0.43 entacapone | 1 0.01 0.44 polymyxin b sulfate | 5 0.05 0.49 pseudoephedrine hcl | 3 0.03 0.52 dextromethorphan hbr | 10 0.10 0.62 hydralazine hcl | 1 0.01 0.63 phenylephrine hcl | 6 0.06 0.69 neomycin sulfate | 12 0.12 0.81 carbetapentane tannate | 1 0.01 0.82 . | 9,918 99.18 100.00 -------------------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016