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The reduced chi‐squared statistic (χ2/µ), and Bayesian information criteria (BIC) as goodness‐of‐fit metrics for different models fit to our training dataset, minimizing either the residual sum‐of‐squares in the relative biological effectiveness (RBE) for a proton dose of 2 Gy (RBE2Gy), or the L2 norm between the predicted and measured survival curves
