Frequencies for first 10,000 rows of route variable in drug2007q1 dataset :

          The route of drug |
             administration |      Freq.     Percent        Cum.
----------------------------+-----------------------------------
                            |      3,714       37.14       37.14
           AURICULAR (OTIC) |          1        0.01       37.15
                     BUCCAL |         12        0.12       37.27
                  CUTANEOUS |          1        0.01       37.28
                     DENTAL |          1        0.01       37.29
               ENDOCERVICAL |          1        0.01       37.30
                   EPIDURAL |          4        0.04       37.34
             INTRA-ARTERIAL |          5        0.05       37.39
              INTRA-UTERINE |         14        0.14       37.53
                INTRADERMAL |          3        0.03       37.56
              INTRAMUSCULAR |         71        0.71       38.27
                INTRAOCULAR |          4        0.04       38.31
            INTRAPERITONEAL |         11        0.11       38.42
                INTRATHECAL |          3        0.03       38.45
                INTRAVENOUS |        639        6.39       44.84
          INTRAVENOUS BOLUS |          7        0.07       44.91
           INTRAVENOUS DRIP |         75        0.75       45.66
               INTRAVESICAL |          6        0.06       45.72
                      NASAL |         11        0.11       45.83
                 OPHTHALMIC |          8        0.08       45.91
                       ORAL |      4,412       44.12       90.03
              OROPHARINGEAL |          1        0.01       90.04
                      OTHER |         24        0.24       90.28
                 PARENTERAL |          6        0.06       90.34
                     RECTAL |         13        0.13       90.47
   RESPIRATORY (INHALATION) |        101        1.01       91.48
               SUBCUTANEOUS |        241        2.41       93.89
                 SUBLINGUAL |          7        0.07       93.96
                    TOPICAL |         21        0.21       94.17
                TRANSDERMAL |         67        0.67       94.84
               TRANSMAMMARY |          1        0.01       94.85
             TRANSPLACENTAL |         34        0.34       95.19
                    UNKNOWN |        475        4.75       99.94
                    VAGINAL |          6        0.06      100.00
----------------------------+-----------------------------------
                      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015