Re: [Rd] plot.lm: "Cook's distance" label can overplot point labels

From: Michael Dewey <info_at_aghmed.fsnet.co.uk>
Date: Fri, 20 Feb 2009 17:22:37 +0000

At 13:05 20/02/2009, John Fox wrote:

>Dear Thomas,
>
>Though far from an expert on the matter, it's my understanding that
>red-green confusion is the most common form of colour-blindness. I guess
>that the best way to put it is that it would be desirable to choose colours
>for the standard palette that minimize the probability of perceptual
>problems.

I wonder whether there are two separate issues: what is the best standard palette and whether mainstream plots should use colour to carry essential information. For instance there seems little problem in biplot having red arrows and black points because the colour is redundant.

I am not an expert on colour vision either but there certainly are people who report difficulty at scientific meetings with interpreting the slides.

>Regards,
> John
>
>
> > -----Original Message-----
> > From: Thomas Lumley [mailto:tlumley_at_u.washington.edu]
> > Sent: February-20-09 4:32 AM
> > To: John Fox
> > Cc: 'John Maindonald'; 'Prof Brian Ripley'; r-devel_at_r-project.org; 'Martin
> > Maechler'
> > Subject: Re: [Rd] plot.lm: "Cook's distance" label can overplot point
>labels
> >
> > On Thu, 19 Feb 2009, John Fox wrote:
> >
> > > Dear John and Brian,
> > >
> > > My point about colour-blindness was partly tongue-in-cheek, but I think
> > that
> > > it's a bad choice to have the second and third colours in the default
> > > palette as red and green.
> > >
> >
> > Looking at the standard palette with dichromat::dichromat() it seems that
>it
> > depends on which flavour of red-green anomaly you have. For deuteranopia
>the
> > red and green are quite close. For protanopia they are pretty distinct and
> > the confusion is between colours 3 and 7 (yellow vs green) and between 4
>and
> > 6 (blue and magenta).
> >
> > I agree that the standard palette isn't ideal, though.
> >
> > -thomas
> >
> > Thomas Lumley Assoc. Professor, Biostatistics
> > tlumley_at_u.washington.edu University of Washington, Seattle
> >
>
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Michael Dewey
http://www.aghmed.fsnet.co.uk



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