Question

[Ignacio Castillo]

> Dear All:
> 
> It is said that Shannon's information/entropy satisfies the additivity
> property. This is, two separate systems can be combined into one
> composite system and the total information for the composite system
> must
> equal the sum of the information of one system plus that of the other.
> I
> understand that information/entropy is measured in bits, however, do
> the
> separate systems must have the same units of measurement? Can I
> combine
> a system that is measured in seconds with a system that is measured in
> some discrete unit, such as persons? Can we talk of a complete finite
> scheme of the combined system or, since the systems have different
> units, do we always have to talk about two schemes that are combined
> to
> produce only one measure of information/entropy?
> Please advice me or point me to references. Thanks.
> 
> Ignacio Castillo


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