# Investigating the impact of development and internal validation design when training prognostic models using a retrospective cohort in big US observational healthcare data

> Research article (BMJ Open, 2021) · cited 29× · AI/ML

**Wikidata**: [openalex:W4200373403](https://www.wikidata.org/wiki/openalex:W4200373403)  
**Source**: https://4ort.xyz/entity/investigating-the-impact-of-development-and-internal-validation-design-when-training-prognostic-models-using-a-retrospec