ESL2 Chapter 17 Undirect Graphical Models

一些名称理解

 

概率图模型边

原文：

Edges : avisual way of understanding the joint distribution

  if absence of two vertices,the corresponding random variables are conditional independent ,given theother variable

 

即边是对两个变量的联合概率（jointdistribution）的一个可视化表达法，当两个变量之间没有边时，指这两个变量在给定变量时是条件独立的（马尔科夫性）

 

LowOrder Probabilities低阶概率 

https://en.wikipedia.org/wiki/Stochastic_ordering

Partially ordered set（偏序集合）集合加一个排序的二元关系

 

In probability theoryand statistics, a stochastic order quantifies the concept of one randomvariable being "bigger" than another. These are usually partialorders, so that one random variable A may be neither stochastically greaterthan, less than nor equal to another random variable B. Many different ordersexist, which have different applications.