Frequencies for first 10,000 rows of route variable in drug2018q4 dataset : The route of drug administration | Freq. Percent Cum. --------------------------------------+----------------------------------- | 2,387 23.87 23.87 Buccal | 5 0.05 23.92 Cutaneous | 7 0.07 23.99 Endocervical | 1 0.01 24.00 Epidural | 1 0.01 24.01 INTRA-AURAL | 1 0.01 24.02 Intra-uterine | 57 0.57 24.59 Intramuscular | 66 0.66 25.25 Intraperitoneal | 2 0.02 25.27 Intrathecal | 5 0.05 25.32 Intravenous (not otherwise specified) | 634 6.34 31.66 Intravenous bolus | 5 0.05 31.71 Intravenous drip | 105 1.05 32.76 Nasal | 3 0.03 32.79 Ophthalmic | 10 0.10 32.89 Oral | 3,921 39.21 72.10 Oropharingeal | 2 0.02 72.12 Other | 8 0.08 72.20 Parenteral | 9 0.09 72.29 Rectal | 7 0.07 72.36 Respiratory (inhalation) | 73 0.73 73.09 Subcutaneous | 301 3.01 76.10 Subdermal | 2 0.02 76.12 Sublingual | 7 0.07 76.19 Topical | 30 0.30 76.49 Transdermal | 66 0.66 77.15 Transmammary | 1 0.01 77.16 Transplacental | 201 2.01 79.17 Unknown | 2,080 20.80 99.97 Vaginal | 3 0.03 100.00 --------------------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 7 Mar 2019