# Why You Should Always Include a Random Slope for the Lower-Level Variable Involved in a Cross-Level Interaction

> Research article (2018) · cited 42× · AI/ML

**Wikidata**: [openalex:W2964322849](https://www.wikidata.org/wiki/openalex:W2964322849)  
**Source**: https://4ort.xyz/entity/why-you-should-always-include-a-random-slope-for-the-lower-level-variable-involved-in-a-cross-level-interaction