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Abstract The isotonic regression problem is to minimize Σt i = 1 gi − xi2wi subject to xi ≤ xj when where wi>0 and gi (i= 1, 2, …, k) are given and is a specified partial ordering on 1, 2, …, k. The solution is called the isotonic regression on g. We formulate a generalization of this problem and calculate its Fenchel dual. A function of the isotonic regression also solves these problems. Problems in inventory theory and statistics are identified as dual isotonic regression problems.
Barlow et al. (Wed,) studied this question.
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