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@article{welch1947,author={B. L. Welch},title={The Generalization of Student's Problem when Several Different Population Variances Are Involved},journal={Biometrika},year={1947},doi={10.1093/biomet/34.1-2.28}}
@misc{mixedmodels,author={{statsmodels developers}},title={Linear Mixed Effects Models documentation},url={https://www.statsmodels.org/stable/mixed_linear.html},note={Accessed 2026-10-13}}
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% DATASET SOURCE NOT VERIFIED for full_data(4).csv; metadata required before external publication. No DOI invented.