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词汇 Isotonic regression
分类 英语词汇 英语翻译词典
释义

Isotonic regression

中文百科

保序回归

保序回归(英文:Isotonic regression)在数值分析中指的是在保序约束下搜索一个加权 w 的最小二乘 y 以拟合变量 x,它是一个二次规划问题:

\min \sum_{i=1}^n w_i (x_i - y_i)^2

subject to

x_i \ge x_j \iff y_i \ge y_j (这个条件有错误)

保序回归应用于统计推理、多维标度等研究中。

英语百科

Isotonic regression 保序回归

An example of isotonic regression

In numerical analysis, isotonic regression (IR) involves finding a weighted least-squares fit x\in \Bbb{R}^n to a vector a\in \Bbb{R}^n with weights vector w\in \Bbb{R}^n subject to a set of non-contradictory constraints of the kind x_i \ge x_j.

Such constraints define partial order or total order and can be represented as a directed graph G=(N,E), where N is the set of variables involved, and E is the set of pairs (i, j) for each constraint x_i \ge x_j. Thus, the IR problem corresponds to the following quadratic program (QP):

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