Finding an incorrect grading pattern

marketa_vackovamarketa_vackova Member Posts: 2 Contributor I
edited November 2018 in Help

I was given a labelled data set and I was told few of the labels are wrongly assigned, i.e. some of the data were graded inaccurately. I'm supposed to find which ones. Which tool in RapidMiner should I use?

I tried the operator Find Outliers (Density), but somehow I feel that is not the one I'm looking for.

Thank you very much for advice. Markéta

Answers

  • IngoRMIngoRM Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, Community Manager, RMResearcher, Member, University Professor Posts: 1,643  RM Founder

    Here is an idea: you could train a model on the data set which is generalizing well (no overfitting, no k-nn with 1 neighbor only, you get the idea...) and then apply this model to the training data set again.  Whenever the prediction differs from the label, this could be a good candidate for wrongly labeled.

     

    Just my 2c,

    Ingo

  • Telcontar120Telcontar120 Moderator, RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,226   Unicorn

    Another potenial approach would be to run a clustering analysis on the labeled classes separately and then look for individual outliers that way.  

     

     

    Brian T.
    Lindon Ventures 
    Data Science Consulting from Certified RapidMiner Experts
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