?s 15:29 de 20/11/2022, G?bor Malomsoki escreveu:> Dear Bert,
>
> Yes, was trying to fill the not existing categories with NAs, but the
> suggested solutions in stackoverflow.com unfortunately did not work.
>
> Best regards
> Gabor
>
>
> Bert Gunter <bgunter.4567 at gmail.com> schrieb am So., 20. Nov.
2022, 16:20:
>
>> You can't predict results for categories that you've not seen
before
>> (think about it). You will need to remove those cases from your test
set
>> (or convert them to NA and predict them as NA).
>>
>> -- Bert
>>
>> On Sun, Nov 20, 2022 at 7:02 AM G?bor Malomsoki <gmalomsoki1980 at
gmail.com>
>> wrote:
>>
>>> Dear all,
>>>
>>> i have created a logistic regression model,
>>> on the train df:
>>> mymodel1 <- glm(book_state ~ TG_KraftF5, data = train, family
>>> "binomial")
>>>
>>> then i try to predict with the test df
>>> Predict<- predict(mymodel1, newdata = test, type =
"response")
>>> then iget this error message:
>>> Error in model.frame.default(Terms, newdata, na.action = na.action,
xlev >>> object$xlevels)
>>> Factor "TG_KraftF5" has new levels
>>>
>>> i have tried different proposals from stackoverflow, but
unfortunately
>>> they
>>> did not solved the problem.
>>> Do you have any idea how to test a logistic regression model when
you have
>>> different levels in train and in test df?
>>>
>>> thank you in advance
>>> Regards,
>>> Gabor
>>>
>>> [[alternative HTML version deleted]]
>>>
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>>>
>>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
hello,
What exactly didn't work? You say you have tried the solutions found in
stackoverflow but without a link, we don't know which answers to which
questions you are talking about.
Like Bert said, if you assign NA to the new levels, present only in
test, it should work.
Can you post links to what you have tried?
Hope this helps,
Rui Barradas