Frequencies for first 10,000 rows of route variable in drug2018q1 dataset : The route of drug administration | Freq. Percent Cum. --------------------------------------+----------------------------------- | 2,502 25.02 25.02 INTRACAVITY | 6 0.06 25.08 Intra-uterine | 11 0.11 25.19 Intramuscular | 154 1.54 26.73 Intraocular | 13 0.13 26.86 Intraperitoneal | 15 0.15 27.01 Intrathecal | 3 0.03 27.04 Intravenous (not otherwise specified) | 698 6.98 34.02 Intravenous bolus | 2 0.02 34.04 Intravenous drip | 87 0.87 34.91 Nasal | 20 0.20 35.11 Ophthalmic | 27 0.27 35.38 Oral | 2,816 28.16 63.54 Oropharingeal | 2 0.02 63.56 Other | 11 0.11 63.67 Parenteral | 7 0.07 63.74 Rectal | 12 0.12 63.86 Respiratory (inhalation) | 211 2.11 65.97 Subcutaneous | 560 5.60 71.57 Subdermal | 4 0.04 71.61 Sublingual | 6 0.06 71.67 Sunconjunctival | 1 0.01 71.68 Topical | 45 0.45 72.13 Transdermal | 23 0.23 72.36 Transmammary | 10 0.10 72.46 Transplacental | 89 0.89 73.35 Unknown | 2,662 26.62 99.97 Vaginal | 3 0.03 100.00 --------------------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 19 Jun 2018