R smbinning package: why 'Too many categories' for some variables? -


i have dataset in r containing many variables of different types , attempting use smbinning package calculate information value.

i using following code:

smbinning.sumiv(sample,y="flag")

this code produces iv of variables, process column states 'too many categories' shown in output below:

                              char     iv                process 12                    relationship     na    many categories 15                     nationality     na    many categories 22               business_activity     na    many categories 23         business_activity_group     na    many categories 25                 local_authority     na    many categories 26                   neighbourhood     na    many categories

if take @ values of business_activity_group instance, can see there not many possible values can take:

   affordable rent combined commercial community combined                       2546                             4       freeholders combined                       garages                         23                             6     general needs combined                     keyworker                      57140                           340         leasehold combined        market rented combined                         88                          1463     older persons combined               rent homebuy                       4774                            76  shared ownership combined   staff acommodation combined                        167                             5         supported combined                       2892

i thought due low volumes in of categories tried banding of groups together. did not change result.

can please explain why 'too many categories' occurs, , can these variables in order produce iv smbinning package?


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