Frequencies for first 10,000 rows of route variable in drug2006q4 dataset :

           The route of drug |
              administration |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                             |      4,823       48.23       48.23
                      BUCCAL |          5        0.05       48.28
                   CUTANEOUS |          4        0.04       48.32
                    EPIDURAL |          5        0.05       48.37
              INTRA-ARTERIAL |          1        0.01       48.38
             INTRA-ARTICULAR |          2        0.02       48.40
               INTRA-UTERINE |         15        0.15       48.55
                INTRACARDIAC |          1        0.01       48.56
               INTRACORONARY |          1        0.01       48.57
                 INTRADERMAL |          1        0.01       48.58
               INTRAMUSCULAR |         41        0.41       48.99
                 INTRAOCULAR |          8        0.08       49.07
             INTRAPERITONEAL |          9        0.09       49.16
                 INTRATHECAL |          6        0.06       49.22
                 INTRAVENOUS |        821        8.21       57.43
           INTRAVENOUS BOLUS |          6        0.06       57.49
            INTRAVENOUS DRIP |         69        0.69       58.18
                INTRAVESICAL |         33        0.33       58.51
                       NASAL |          9        0.09       58.60
                  OPHTHALMIC |         17        0.17       58.77
                        ORAL |      2,969       29.69       88.46
               OROPHARINGEAL |          1        0.01       88.47
                       OTHER |         12        0.12       88.59
                  PARENTERAL |          6        0.06       88.65
                  PERINEURAL |          1        0.01       88.66
                      RECTAL |          5        0.05       88.71
    RESPIRATORY (INHALATION) |         86        0.86       89.57
                SUBCUTANEOUS |        271        2.71       92.28
                  SUBLINGUAL |          1        0.01       92.29
                     TOPICAL |         32        0.32       92.61
                 TRANSDERMAL |         86        0.86       93.47
              TRANSPLACENTAL |         31        0.31       93.78
                     UNKNOWN |        615        6.15       99.93
                     VAGINAL |          7        0.07      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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