Frequencies for first 10,000 rows of route variable in ful20182 dataset :

                                  Route |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
DENTAL                               .. |          1        0.01        0.01
NASAL                                .. |          9        0.09        0.10
OPHTHALMIC                           .. |         37        0.37        0.47
ORAL                                 .. |      9,647       96.47       96.94
ORAL, RECTAL                         .. |          8        0.08       97.02
ORAL-28                              .. |         39        0.39       97.41
OTIC                                 .. |          2        0.02       97.43
RECTAL                               .. |         16        0.16       97.59
SUB-Q                                .. |          3        0.03       97.62
SUBLINGUAL                           .. |         28        0.28       97.90
TOPICAL                              .. |         97        0.97       98.87
TRANSDERM                            .. |         53        0.53       99.40
TRANSDERMAL                          .. |         58        0.58       99.98
VAGINAL                              .. |          2        0.02      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 1 Mar 2018