Frequencies for first 10,000 rows of route variable in drug2017q4 dataset :

     The route of drug administration |      Freq.     Percent        Cum.
--------------------------------------+-----------------------------------
                                      |      2,057       20.57       20.57
                            Cutaneous |          3        0.03       20.60
                       Intra-arterial |          4        0.04       20.64
                        Intra-uterine |          4        0.04       20.68
                        Intramuscular |        141        1.41       22.09
                          Intraocular |         12        0.12       22.21
                      Intraperitoneal |          4        0.04       22.25
                          Intrathecal |          9        0.09       22.34
Intravenous (not otherwise specified) |        729        7.29       29.63
                    Intravenous bolus |          9        0.09       29.72
                     Intravenous drip |        179        1.79       31.51
                                Nasal |         25        0.25       31.76
                           Ophthalmic |         22        0.22       31.98
                                 Oral |      3,720       37.20       69.18
                        Oropharingeal |          1        0.01       69.19
                                Other |         46        0.46       69.65
                           Parenteral |          1        0.01       69.66
                               Rectal |          4        0.04       69.70
             Respiratory (inhalation) |        156        1.56       71.26
                         Subcutaneous |        482        4.82       76.08
                            Subdermal |          1        0.01       76.09
                           Sublingual |          5        0.05       76.14
                              Topical |         22        0.22       76.36
                          Transdermal |         62        0.62       76.98
                         Transmammary |          4        0.04       77.02
                       Transplacental |         65        0.65       77.67
                              Unknown |      2,229       22.29       99.96
                             Urethral |          1        0.01       99.97
                              Vaginal |          3        0.03      100.00
--------------------------------------+-----------------------------------
                                Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Jun 2018