Frequencies for first 10,000 rows of route variable in drug2006q1 dataset :

           The route of drug |
              administration |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                             |      4,555       45.55       45.55
                      BUCCAL |          3        0.03       45.58
                      DENTAL |          1        0.01       45.59
                    EPIDURAL |         17        0.17       45.76
                HEMODIALYSIS |         10        0.10       45.86
              INTRA-ARTERIAL |          4        0.04       45.90
               INTRA-UTERINE |         10        0.10       46.00
               INTRACORONARY |          2        0.02       46.02
               INTRAMUSCULAR |         92        0.92       46.94
                 INTRAOCULAR |          1        0.01       46.95
                 INTRATHECAL |          8        0.08       47.03
                 INTRAVENOUS |        586        5.86       52.89
           INTRAVENOUS BOLUS |          2        0.02       52.91
            INTRAVENOUS DRIP |         91        0.91       53.82
                INTRAVESICAL |          2        0.02       53.84
                       NASAL |          7        0.07       53.91
                  OPHTHALMIC |         13        0.13       54.04
                        ORAL |      3,119       31.19       85.23
               OROPHARINGEAL |          2        0.02       85.25
                       OTHER |         17        0.17       85.42
                  PARENTERAL |         17        0.17       85.59
                  PERINEURAL |          2        0.02       85.61
                      RECTAL |          5        0.05       85.66
    RESPIRATORY (INHALATION) |         44        0.44       86.10
                SUBCUTANEOUS |        168        1.68       87.78
                  SUBLINGUAL |         10        0.10       87.88
                     TOPICAL |         22        0.22       88.10
                 TRANSDERMAL |         37        0.37       88.47
              TRANSPLACENTAL |         21        0.21       88.68
                     UNKNOWN |      1,127       11.27       99.95
                     VAGINAL |          5        0.05      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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