Frequencies for first 10,000 rows of route variable in drug2016q4 dataset :

     The route of drug administration |      Freq.     Percent        Cum.
--------------------------------------+-----------------------------------
                                      |      2,055       20.55       20.55
                               Buccal |          1        0.01       20.56
                        Intra-uterine |          5        0.05       20.61
                        Intramuscular |         91        0.91       21.52
                     Intrapericardial |          1        0.01       21.53
                      Intraperitoneal |          4        0.04       21.57
                          Intrathecal |          1        0.01       21.58
                        Intratracheal |          3        0.03       21.61
Intravenous (not otherwise specified) |        907        9.07       30.68
                    Intravenous bolus |          4        0.04       30.72
                     Intravenous drip |        148        1.48       32.20
                         Intravesical |          1        0.01       32.21
                                Nasal |         14        0.14       32.35
                           Ophthalmic |         44        0.44       32.79
                                 Oral |      4,032       40.32       73.11
                                Other |         19        0.19       73.30
                           Parenteral |         11        0.11       73.41
                               Rectal |          6        0.06       73.47
             Respiratory (inhalation) |        144        1.44       74.91
                         Subcutaneous |        487        4.87       79.78
                            Subdermal |          5        0.05       79.83
                           Sublingual |          9        0.09       79.92
                              Topical |         26        0.26       80.18
                          Transdermal |         18        0.18       80.36
                         Transmammary |          1        0.01       80.37
                       Transplacental |         55        0.55       80.92
                              Unknown |      1,906       19.06       99.98
                              Vaginal |          2        0.02      100.00
--------------------------------------+-----------------------------------
                                Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Sep 2017