On Mon, Nov 05, 2012 at 04:45:55PM -0500, John Mikes wrote:
> Dear Russell,
> I have my doubts about "causality" as a *complete* term: our 'systems', cf:
> ecosystem etc. include the up-to-date inventory of knowables as in our
> existing "MODEL" of the world - which grows over the millennia
> stepwise. (The 'cause' of the lightning is no more the "ire" of Zeus).
> Whatever we include as 'causing' a change (whatever) is the portion of its
> entailments selectable from said inventory (of yesterday). This causes the
> uncertainty and occasional mishaps in our "world". Besides: our terms are
> proportionate, content and qualia (may be) incomplete restricted to said
> inventory, so the partial entailment we observe may seem satisfactory to
> the actual 'model-item' we carry. (((How's THAT with AL?)))

Not sure I fully ingest what you're saying here. Causality has to do
with explanations, whilst correlations needn't. I think some of the
notions of causality - eg Granger causality, have to do with
quantifying the information flow between time series - if timeseries A
provides more predictive information about time series B than some
threshold (not necessarily arbitrary, but usually theory dependent),
then we say that A Granger-causes B. It is not correlation, as
correlation is bidirectional, whereas Granger-causality is not. Also A
Granger-causes B can be read as series A explaining something about
series B.

> ------------------
>  We had a little exchange on "random" earlier when you resorted to the term
> (as I recall): as *provisonal (or conditional?) random* that may occur *under
> the given conditions only*.
> ((I just wrote to Hal R. that a "random walk" in evolution could lead *us,
> humans* (back???) - maybe - to *DE*-velop into trilobites. Why not?))
> John Mikes

That would be surprising, given we're not descended from trilobytes in
the first place!


Prof Russell Standish                  Phone 0425 253119 (mobile)
Principal, High Performance Coders
Visiting Professor of Mathematics      hpco...@hpcoders.com.au
University of New South Wales          http://www.hpcoders.com.au

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