[R] distinguish regression lines in grouped, black and white lattice xyplot

[Katharina May]

That's a point. I justed wanted to provide an overview for myself to
see the tendencies in a direct comparement
and with an easy way to distinct them, but maybe the text panel can
help me with that...

Well anyway, is it right that a grouped black and white plot can
contain a maxinum of 8 distinguishable  lines or might
there be a way to increase that?
I know some graphics from papers containing lines with equally
distance points on the lines (one type of point per line)
as a form of distinction. Can this be realised using grouped lattice
plots with regression lines?


2009/6/24 Bert Gunter <gunter.berton at gene.com>:
> Don't be silly. They can't be made "distinguishable" by any number of line
> types and/or colors. The brain can't keep that many different symbol
> representations straight. Referring back and forth to a legend is also
> similarly useless. You need to think more creatively about how to make a
> more meaningful display to provide viewers interpretable information.
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
>
>
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
> Behalf Of Katharina May
> Sent: Wednesday, June 24, 2009 12:28 PM
> To: r-help at r-project.org
> Subject: [R] distinguish regression lines in grouped,black and white lattice
> xyplot
>
> Hi,
>
> I've got the following problem which I cannot think of a solution right now:
>
> if got a lattice xyplot in black and white and a grouping variable
> with many (more than 8
> values) and I plot it as regression lines (type="r"), just like this
> one (not reproducable but that's
> I guess not the point here):
>
> xyplot(log(AGWB) ~ log(BM_roots), data=sub_agwb_data, groups=species,
> type="r", lty=c(1:6),panel=allo.panel.5)
>
> The problem is that I've got 26 different values for the grouping
> variable species and only 6 default values for the line type
> lty (and according to the par {graphics} help page customizable to up
> to 8 different line types).
>
> Does anybody have any idea how these 26 different lines can be made
> distinguishable from each other without the use
> of colors?
>
> Thanks,
>
>         Katharina
>
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>



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