"KNN and missing values"

AMMS
AMMS New Altair Community Member
edited November 5 in Altair RapidMiner

Hi,

I am studying the algorithm IBK. But I don´t understand how the distance is calculated with an instance that has missing values.
I suspect away with any missing value is assigned zero, regardless of whether the attribute is continuous or nominal .. but I want to confirm.
Another hypothesis is that the algorithm first impute missing values with media..but I don´t sure if so..
I appreciate your help
Alex

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