Frequencies for first 10,000 rows of route variable in drug2005q4 dataset :

           The route of drug |
              administration |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                             |      4,729       47.29       47.29
            AURICULAR (OTIC) |          3        0.03       47.32
                      BUCCAL |          5        0.05       47.37
                    EPIDURAL |          1        0.01       47.38
               INTRA-UTERINE |          8        0.08       47.46
               INTRAMUSCULAR |         95        0.95       48.41
                 INTRAOCULAR |          2        0.02       48.43
             INTRAPERITONEAL |          1        0.01       48.44
                 INTRATHECAL |          7        0.07       48.51
                  INTRATUMOR |          1        0.01       48.52
                 INTRAVENOUS |        730        7.30       55.82
           INTRAVENOUS BOLUS |          4        0.04       55.86
            INTRAVENOUS DRIP |         43        0.43       56.29
                INTRAVESICAL |          7        0.07       56.36
                       NASAL |         14        0.14       56.50
                  OPHTHALMIC |          5        0.05       56.55
                        ORAL |      3,138       31.38       87.93
               OROPHARINGEAL |          4        0.04       87.97
                       OTHER |         20        0.20       88.17
                  PARENTERAL |          8        0.08       88.25
                  PERINEURAL |          2        0.02       88.27
                      RECTAL |          8        0.08       88.35
    RESPIRATORY (INHALATION) |         85        0.85       89.20
                SUBCUTANEOUS |        162        1.62       90.82
                  SUBLINGUAL |          4        0.04       90.86
                     TOPICAL |         35        0.35       91.21
                 TRANSDERMAL |         59        0.59       91.80
              TRANSPLACENTAL |         17        0.17       91.97
                     UNKNOWN |        797        7.97       99.94
                     VAGINAL |          6        0.06      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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