Frequencies for first 10,000 rows of route variable in drug2007q4 dataset : The route of drug | administration | Freq. Percent Cum. -----------------------------+----------------------------------- | 4,923 49.23 49.23 BUCCAL | 6 0.06 49.29 EPIDURAL | 4 0.04 49.33 INTRA-ARTERIAL | 4 0.04 49.37 INTRA-UTERINE | 13 0.13 49.50 INTRADERMAL | 1 0.01 49.51 INTRAMUSCULAR | 79 0.79 50.30 INTRAOCULAR | 25 0.25 50.55 INTRAPERITONEAL | 19 0.19 50.74 INTRASYNOVIAL | 1 0.01 50.75 INTRATHECAL | 23 0.23 50.98 INTRAVENOUS | 604 6.04 57.02 INTRAVENOUS BOLUS | 5 0.05 57.07 INTRAVENOUS DRIP | 34 0.34 57.41 INTRAVESICAL | 7 0.07 57.48 NASAL | 11 0.11 57.59 OPHTHALMIC | 14 0.14 57.73 ORAL | 3,248 32.48 90.21 OROPHARINGEAL | 1 0.01 90.22 OTHER | 4 0.04 90.26 PARENTERAL | 3 0.03 90.29 RECTAL | 15 0.15 90.44 RESPIRATORY (INHALATION) | 67 0.67 91.11 SUBCONJUNCTIVAL | 1 0.01 91.12 SUBCUTANEOUS | 238 2.38 93.50 SUBLINGUAL | 4 0.04 93.54 TOPICAL | 44 0.44 93.98 TRANSDERMAL | 47 0.47 94.45 TRANSPLACENTAL | 28 0.28 94.73 UNKNOWN | 524 5.24 99.97 VAGINAL | 3 0.03 100.00 -----------------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Dec 2015