Frequencies for first 10,000 rows of route variable in drug2005q3 dataset :

           The route of drug |
              administration |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                             |      4,443       44.43       44.43
                      BUCCAL |          5        0.05       44.48
                ENDOTRACHEAL |          3        0.03       44.51
                    EPIDURAL |         13        0.13       44.64
              INTRA-ARTERIAL |          4        0.04       44.68
             INTRA-ARTICULAR |          2        0.02       44.70
               INTRA-UTERINE |         36        0.36       45.06
   INTRADISCAL (INTRASPINAL) |          1        0.01       45.07
               INTRAMUSCULAR |        104        1.04       46.11
                 INTRAOCULAR |          3        0.03       46.14
             INTRAPERITONEAL |          3        0.03       46.17
                 INTRATHECAL |         10        0.10       46.27
                 INTRAVENOUS |        761        7.61       53.88
           INTRAVENOUS BOLUS |          6        0.06       53.94
            INTRAVENOUS DRIP |         43        0.43       54.37
                INTRAVESICAL |         11        0.11       54.48
                       NASAL |          5        0.05       54.53
                  OPHTHALMIC |         17        0.17       54.70
                        ORAL |      2,875       28.75       83.45
               OROPHARINGEAL |        337        3.37       86.82
                       OTHER |         12        0.12       86.94
                  PARENTERAL |          9        0.09       87.03
               PERIARTICULAR |          1        0.01       87.04
                      RECTAL |         11        0.11       87.15
    RESPIRATORY (INHALATION) |         79        0.79       87.94
                SUBCUTANEOUS |        206        2.06       90.00
                  SUBLINGUAL |          3        0.03       90.03
                     TOPICAL |         32        0.32       90.35
                 TRANSDERMAL |         32        0.32       90.67
              TRANSPLACENTAL |         24        0.24       90.91
                     UNKNOWN |        905        9.05       99.96
                     VAGINAL |          4        0.04      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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