NOMINAL VALUE ERROR

[shinapahuja]

I AM PERFORMING DATA MINING (CLASSIFICATION) BUT GETTING AN ERROR OF NON COMPATIBLE NOMINAL VALUE. zomato1.xls (816.5 KB)
Pls check which column is causing error

[MH]

Depending on the model you try to use (Descision Tree for example), you need at least one string column (NominalValue). You can easily convert your “Class” column to a string with the “Number to String” Node and you are good to go.

[mlauber71]

Hmm I turned your data into a multi class scoring example. Maybe you would want to have a look at it. Not sure if this is of any help for you.

Metrics in multiclass classification

I used this example to turn it into a workflow to predict multiple classes. And I also added the accuracy statistics. One with F1 in Python but also the KNIME Scorer which also has a “micro” F1 as “Accuracy” - so the Python is more there to test the logic. I am though a little bit reluctant to just use such multiple classifications as targets. Maybe someone could weight in who has more experience in that field. And of course you should be careful and test your results with real life data (…