[KongchangAI]
Unverified50% confidenceFactExact time

One-hot encoding has a dummy variable trap: if all k columns are kept while an intercept term is fitted, the features become perfectly collinear; although logistic regression can mitigate this through regularization, drop='first' is usually still used to remove one column.

1
Sources
50%
Confidence
Long-term
Relevance
10/12/2026
First Seen

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