Frequencies for first 10,000 rows of route variable in ful20184 dataset :

                                  Route |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
DENTAL                               .. |          3        0.03        0.03
NASAL                                .. |         11        0.11        0.14
OPHTHALMIC                           .. |         36        0.36        0.50
ORAL                                 .. |      9,653       96.53       97.03
ORAL, RECTAL                         .. |          8        0.08       97.11
ORAL-28                              .. |         47        0.47       97.58
RECTAL                               .. |         16        0.16       97.74
SUB-Q                                .. |          3        0.03       97.77
SUBLINGUAL                           .. |         30        0.30       98.07
TOPICAL                              .. |         93        0.93       99.00
TRANSDERM                            .. |         41        0.41       99.41
TRANSDERMAL                          .. |         57        0.57       99.98
VAGINAL                              .. |          2        0.02      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 30 Apr 2018