- `as.numeric(f)` returns **integer codes**

not original values. Use `as.numeric(levels(f))[f]` or `as.numeric(as.character(f))`.

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PublishedApr 15, 2026

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- as.numeric(f) returns integer codes

not original values. Use as.numeric(levels(f))[f] or as.numeric(as.character(f)).

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