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Risk models can be the sum or product of terms. Each\nterm is the product of exponential/linear functions of\ncovariates. Additionally sub-terms can be defined as a sum of\nexponential, linear threshold, and step functions. Cox\nProportional hazards\n,\nPoisson , and\nFine-Gray competing risks\n\nregression are supported. This work was sponsored by NASA\nGrants 80NSSC19M0161 and 80NSSC23M0129 through a subcontract\nfrom the National Council on Radiation Protection and\nMeasurements (NCRP). 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