Predictor importance vertical axis unit

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sarah Abdellahi on 10 Oct 2018

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https://nl.mathworks.com/matlabcentral/answers/423282-predictor-importance-vertical-axis-unit

Edited: sarah Abdellahi on 10 Oct 2018

Hello :) I am reading the fitctree document on (https://www.mathworks.com/help/stats/fitctree.html) and wondering what is unit on the vertical axis? The range is 6*10^-5. Is it a non-dimensional value and just shows a comparison? If so, any explanation would be appreciated.

Thank you