# Lost in the Forest: Encoding categorical variables and the absent levels problem

> Research article (Data Mining and Knowledge Discovery, 2024) · cited 13× · AI/ML

**Wikidata**: [openalex:W4394684642](https://www.wikidata.org/wiki/openalex:W4394684642)  
**Source**: https://4ort.xyz/entity/lost-in-the-forest-encoding-categorical-variables-and-the-absent-levels-problem