A package for computing an estimator in the problem of univariate Unlinked Monotone Regression. See Balabdaoui, Doss, and Durot (2021).
The main function is UMRactiveSet_trust, which uses the trust region for second order optimization of the nonconvex objective function as a subroutine. Other functions for optimizing are also provided, for comparisons; these include gradDesc_PC (for Gradient Descent for Piecwise Constant functions), gradDesc. The former is faster than the latter (but slower than the second order method). The latter is the more naive vanilla gradient descent method (can be used for instance to double check results from gradDesc_PC).
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