On Thu, 29 Mar 2001 10:17:09 +0200, "Nicolas Voirin"
<[EMAIL PROTECTED]> wrote:
> OK, thanks.
>
> In fact, it's a "visual" method to see a set of points with the better
> view (maximum of variance).
> It's like to swivel a cube around to see all of its sides ... but this
> in more than 3D.
> When I show points in differents planes (F1-F2, F2-F3, F2-F4 ... for
> example), I make rotations, isn't it ?
I think I would use the term, "projection" onto specific planes, if
you are denoting x,y, and z (for instance) with F1, F2, F3 :
You can look at the <projection onto the> x-y plane, the y-z plane,
and so on.
Here is an example in 2 dimensions, which suggests a simplified
version of an old controversy about 'intelligence'--
tests might provide two scores of Math=110, Verbal= 90.
However, the abilities can be reported, with no loss of detail, as
General= 100, M-versus-V= +20. Historically, Spearman wanted
us all to conclude that "Spearman's g" had to exist as a mental
entity, since its statistical description could be reliably produced.
--
Rich Ulrich, [EMAIL PROTECTED]
http://www.pitt.edu/~wpilib/index.html
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