Out of sample prediction with new category

[f2e2f]

@jessegrabowski

Another option is to set all the country offsets to zero, which amounts to using the hyper-mean (a in the example code) to say something about an unknown county.

Thanks for the confirmation.

What do you mean by “You don’t want it to just be an empty “fake index”, though, otherwise doing inference with it is pointless.”.

For using the hypermean:
Do you know of any code to do so?