An XGBoost ITS maps multimodal features from 10,360 videos to BARS scores and delivers layered feedback that produced significant skill gains (Cohen's d 0.39-0.90) in a 30-day study of 204 learners.
Comparing the Pearson and Spearman correlation coefficients across distributions and sample sizes: A tutorial using simulations and empirical data
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An Interpretable Closed-Loop Intelligent Tutoring System for Multimodal Affective Feedback in Asynchronous Presentation Training
An XGBoost ITS maps multimodal features from 10,360 videos to BARS scores and delivers layered feedback that produced significant skill gains (Cohen's d 0.39-0.90) in a 30-day study of 204 learners.