Re: ECI 2002V or 2002R?
Re: ECI 2002V or 2002R?
- Subject: Re: ECI 2002V or 2002R?
- From: Graeme Gill <email@hidden>
- Date: Mon, 30 Sep 2002 12:17:39 +1000
bruce fraser wrote:
>
You always start out with some set of numbers where the channels
>
vary systematically. To create a scrambled chart requires a
>
non-trivial extra step.
Not always true. The way I create charts I end up with no
obvious order of test points (this is because I throw the
number of points I want into 3D or 4D space, and then move
them around to optimize certain criteria, like even spacing
in perceptual space). One can sort them by some criteria, but
even then there is still an arbitrariness to it. Scrambled
charts are therefore natural using some approaches.
Graeme Gill.
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