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Hi, I’m new to machine learning and doing a project for an introduction course at uni. We are using weka. On my dataset, before preprocessing, the base % for J48 is 99.8%. I can’t work out why it’s so high. My lecturer said it should be around 50/60% but I’m not sure what I’m doing wrong. Someone suggested data leakage but I’m not sure what to change. Any tips would be greatly appreciated!
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