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"[SOLVED] threshold in ROC curve chart"

karate405karate405 Member Posts: 2 Contributor I
edited June 2019 in Help
Hi,

I just wonder, if those threshold in ROC chart is a same idea as cutting point (threshold?)
by executing bi-nominal classification.

Best regards,

Shingo



Answers

  • MariusHelfMariusHelf RapidMiner Certified Expert, Member Posts: 1,869   Unicorn
    Hi Shingo,

    the threshold refers to the confidence value of the prediction. You can read it like this: if the confidence of the example to be positive is greater than the threshold, the example will be classified as positive, if the confidence is below the threshold, it will be classified as negative.

    You can experiment with thresholds by using the Create Threshold and Apply Threshold operators after classification, but before applying the Performance operator.

    If you have further questions, don't hesitate to ask :)

    All the best,
    Marius
  • karate405karate405 Member Posts: 2 Contributor I
    Hi Marius,

    Thank you very much for your reply.
    Now, I understand what it indicates.

    Thank you very much,

    Shingo

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