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Questions tagged [conditional-independence]

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2 votes
1 answer
66 views

Is $B \perp\kern-5pt\perp C | A $ for the two graphical models?

I would like to know whether $B \perp\kern-5pt\perp C | A $ in the following two graphical models and would like to know if my reasoning is correct: For the left graphical model, which is a Belief ...
user's user avatar
  • 71
5 votes
2 answers
187 views

Can $X_1$ and $X_2$ be independent conditioning on $X_1+X_2$?

Suppose that $X_1$ and $X_2$ are independent. I wonder if $X_1$ and $X_2$ conditioning on $X_1+X_2$ can be independent as well. If $X_1$ and $X_2$ are normally distributed, then the above statement is ...
user1292919's user avatar
2 votes
1 answer
113 views

Quick way to determine the different independence assumptions

This question is different than my previous question in that I'm asking sort of a "meta" question. Here's two graphical models (a Belief Network and a Markov Network): I would like to ...
user's user avatar
  • 71
2 votes
1 answer
150 views

Independence and conditional distribution

In a problem that I'm solving I find that: "Let data (yi,xi) be sampled randomly from a two-dimensional distribution such that y|x is N(ɑ,x^2σ^2)". Are y and x i.i.d? maybe just identically ...
Albert's user avatar
  • 55
1 vote
0 answers
66 views

Conditional independence statements for probabilistic motivation for linear regression

So the motivation for using the squared loss in linear regression can be written as the following (I think): Assume $\{(\mathbf{x}_i, y_i) \mid i = 1, \dots n\}$ are repeated independent samples from ...
Dylan Dijk's user avatar
1 vote
1 answer
145 views

Determining unconditional independence in Markov Networks

I would like to know whether $E \perp\kern-5pt\perp A $ in the following Markov Network and would like to know if my reasoning is correct: So, since this is a Pairwise Markov Network, it factorizes ...
user's user avatar
  • 71
1 vote
1 answer
50 views

Is $C \perp\kern-5pt\perp D | A $ for the two graphical models? [duplicate]

I would like to know whether $C \perp\kern-5pt\perp D | A $ in the following two graphical models and would like to know if my reasoning is correct: For the left model (Belief Network), here's my ...
user's user avatar
  • 71