Hi,

1. Im a bit confused with regards to the difference between:I(X;Y;Z) and I(X;Y,Z)

2. Furthermore, I understand I(X;Y;Z) is not necessarily non-negative, so I presume it cannot be compared to normal mutual information. For instance I(X;Y;Z) – I(X;Y) is invalid?

3. How can one compute both I(X;Y;Z) and I(X;Y,Z) based on observed frequencies?

Could someone help me out? Thanks in advance.

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