Definition of Lift

B_MinerB_Miner Member Posts: 72 Contributor II
edited November 2018 in Help
Hi All,

Can anyone explain how RM is defining "lift" as it pertains to the binomial classifer performance operator?

I am used to lift, in this sense, as being the proportion of the top X% of cases sorted by confidence/probability descending, divided by the overall proportion of positive cases in the data. I cant find how you would set the X% in RM. Is my definition correct and is a X% set (non changeable)?



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    landland RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 2,531 Unicorn
    It is defined as:

    lift = x/y with
    x = counter / (counter + counter);
    y = (counter + counter) / (counter + counter + counter + counter);
    and first index being the true label, and the second the predicted.
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    B_MinerB_Miner Member Posts: 72 Contributor II
    Thanks Sebastian!

    I just figured out how to look at code through Eclipse so I found the code you supplied.

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