Not detecting any outliers on purely categorical datasets

[ToxicFyre]

outliertree_test.zip

Hello, I am comparing some outlier detectors on purely categorical datasets, but whenever I run OutlierTree on purely categorical datasets it doesn't return any outliers (With some exceptions). Is there any different parameterization that you recommend?

I attached a sample of what I am using to test it, so you can see what I mean.

Cheers and thanks for the help,
ToxicFyre

[david-cortes]

Indeed, if you look at the parameters, it has something about minimum sizes of branches to split. Apart from that, categorical outliers are just harder to identify. Ideas for criteria are welcome.

[ToxicFyre]

Thank you for your reply. Yes, I noticed that having a few ordinal and numerical columns really helps in this case, to provide additional information. I'll be sure to share any ideas for criteria that I have in the future.

Thank you for your time,
ToxicFyre