Le 13 nov. 08 à 19:35, Randall Reetz a écrit :

Thank you Francois,

Can statistics be rigorously derived from proability math?  I hope so.
yes, that is the "clean" way, which is, by the way, the best suited for academic teaching.

Both are heavily dependent on what appears to be statistics ("both" refers here to my twin gods). I am a self admitted thermodynamics and information science freak. I'd hate to think that my whole world was anecdotally argued. I do see a strange but familiar symmetry between the finite/infinite distinction that seperates probability theory and practice, and the open/closed system maths that seperates the thermodynamic engineering from pure science.

Randall


I dug up my old textbooks on statistical physics (which is another word for thermodynamics) and the textbook is entirely based on probabilistic methods. The official motivation for statistical physics is that, for "macroscopic" systems, the behaviour of" individual" elements are not observable, so you only have access to their statistics.

I won't digress more on this subject, as it is OT. Just one last word: even in you stick to deterministic models, sampling, aka A/D converters, is a tricky issue, for reasons which are similar to experiments on probabilistically modeled systems: the data set that is accessible to you is of measure zero with respect to the (hidden) set of data that lives in the model. In practice, unless you enforce stronger assumptions on the model, there is now way to bring contradiction to the mathematical model by means of a suitable experiment.

Now, back to rev...

cheers
        François

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