Frequencies for first 10,000 rows of route variable in drug2010q4 dataset :

           The route of drug |
              administration |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                             |      4,461       44.61       44.61
                      022201 |          1        0.01       44.62
                      075306 |          1        0.01       44.63
                      BUCCAL |          2        0.02       44.65
                   CUTANEOUS |          1        0.01       44.66
                      DENTAL |          1        0.01       44.67
               INTRA-UTERINE |         85        0.85       45.52
               INTRAMUSCULAR |        285        2.85       48.37
                 INTRAOCULAR |         31        0.31       48.68
             INTRAPERITONEAL |         10        0.10       48.78
                 INTRATHECAL |          1        0.01       48.79
                 INTRAVENOUS |      1,094       10.94       59.73
           INTRAVENOUS BOLUS |          1        0.01       59.74
            INTRAVENOUS DRIP |         91        0.91       60.65
                       NASAL |          5        0.05       60.70
                  OPHTHALMIC |         13        0.13       60.83
                        ORAL |      2,702       27.02       87.85
                       OTHER |          8        0.08       87.93
                  PARENTERAL |         13        0.13       88.06
                      RECTAL |          5        0.05       88.11
    RESPIRATORY (INHALATION) |         59        0.59       88.70
                SUBCUTANEOUS |        361        3.61       92.31
                   SUBDERMAL |          1        0.01       92.32
                  SUBLINGUAL |         10        0.10       92.42
                     TOPICAL |         25        0.25       92.67
                 TRANSDERMAL |        138        1.38       94.05
              TRANSPLACENTAL |         41        0.41       94.46
                     UNKNOWN |        549        5.49       99.95
                     VAGINAL |          5        0.05      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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