Frequencies for first 10,000 rows of route variable in drug2012q1 dataset :

           The route of drug |
              administration |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                             |      4,511       45.11       45.11
                      BUCCAL |          3        0.03       45.14
                   CUTANEOUS |          1        0.01       45.15
              INTRA-ARTERIAL |          1        0.01       45.16
             INTRA-ARTICULAR |          4        0.04       45.20
               INTRA-UTERINE |         23        0.23       45.43
                 INTRADERMAL |          1        0.01       45.44
               INTRAMUSCULAR |        152        1.52       46.96
                 INTRAOCULAR |          5        0.05       47.01
             INTRAPERITONEAL |          2        0.02       47.03
                 INTRATHECAL |          2        0.02       47.05
                 INTRAVENOUS |        589        5.89       52.94
           INTRAVENOUS BOLUS |         14        0.14       53.08
            INTRAVENOUS DRIP |        163        1.63       54.71
                INTRAVESICAL |          1        0.01       54.72
                       NASAL |         11        0.11       54.83
OCCLUSIVE DRESSING TECHNIQUE |          2        0.02       54.85
                  OPHTHALMIC |         25        0.25       55.10
                        ORAL |      3,373       33.73       88.83
               OROPHARINGEAL |          4        0.04       88.87
                       OTHER |         24        0.24       89.11
                  PARENTERAL |          1        0.01       89.12
                      RECTAL |          7        0.07       89.19
    RESPIRATORY (INHALATION) |         37        0.37       89.56
                SUBCUTANEOUS |        281        2.81       92.37
                   SUBDERMAL |          1        0.01       92.38
                  SUBLINGUAL |          5        0.05       92.43
                     TOPICAL |         31        0.31       92.74
                 TRANSDERMAL |         69        0.69       93.43
              TRANSPLACENTAL |         57        0.57       94.00
                     UNKNOWN |        593        5.93       99.93
                     VAGINAL |          7        0.07      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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