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When I wrote "To get into mathematical discussions about this is a
waste of time," I was referring to the continuing discussion about
linear functions (transformations) and dimensional coherency. I was
in a hurry and simply posted to the last message in the thread and
didn't mean that I think *all* mathematical discussions are a waste of
time. In fact, I'll be happy to provide a mathematical discussion to
show why I think the "log scale" approach you mentioned for angles is
unsound. Just let me know...
*My opinion* on linear transformations and dimensionally coherency is,
interesting thought but what's the practical application for the
forum? I provided two simple ways to test for dimensional coherency
that will always work and can be applied by almost any forum member.
Oh, and one of them described how to do it with AmiBroker (this is the
AmiBroker User's List after all). But this is my opinion and everyone
is entitled to their own. Here's my post with the two tests:
http://groups.yahoo.com/group/amibroker/message/42964
Mark
--- In amibroker@xxxxxxxxxxxxxxx, "fgornati" <fgornati@xxxx> wrote:
> --- In amibroker@xxxxxxxxxxxxxxx, "MarkF2" <feierstein@xxxx> wrote:
> > To get into mathematical discussions about this is a waste of
time.
> > It would require precise definitions and could even degenerate
into
> > the posting of formal proofs. Is that what this forum is about?
> I don't want to make this discussion too long but if you make a
> general statement, such as what you did, you also need to explain it
> in general terms to hold it as valid.
>
> > Instead, simply make a group in your database with two files of
test
> > data... one would contain "real" historical data and the second
> would
> > contain the *price data* (O,H,L,C) from the real file miltiplied
by
> a
> > constant that is not equal to 1. Then put up the original angle
> > indicator and toggle back and forth between the two data files if
> you
> > want a visually compelling example of incoherency. You'll also
> have a
> > tool to easily test any other theories about which indicators or
> > systems are dimensionally coherent.
>
> As Fred already said you should use *log scale* if you want to
> mantain the increment rate indipendent from the unit of misure.
> Try to plot this
> Plot(C, "", 1, 1);
> Plot(2*C, "", 1, 1);
> in a logaritmic chart and trace the parallel lines. You will have
the
> same angles.
>
> Franco
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