Hi @beginner
Which node provides the class weights approach?
That would be SMOTE, but I would recommend to start with something simple 
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Hi @zizoo,
the XGBoost nodes in KNIME allow to use weights in the binary classification setup. See discussion about a caveat here: xgboost: Scale positive weight. This will not directly apply to your original regression problem, but once you re-formulate in a binary classification context.
Alternatively, you can use
that allows to use a column of weights. Other H2O models might have this option as well- you would need to have a look but you can start with Random Forest or GBM.
Best regards,
Mischa
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