[R] changing font size in plot(effect())

[John Fox]

Dear Emilie,

This is, I guess, the effect() function in the effects package. If so,
note that the plot.effect() method uses trellis graphics (via the
lattice package), not standard R graphics, so you have to control
aspects of the plot in a manner consistent with trellis graphics.

Unfortunately, you can't just specify the scales argument when you call
plot(), since plot.effect() already includes a scales argument when it
calls xyplot(). You can, however, set trellis parameters globally,
e.g., via something like

axis.text <- trellis.par.get("axis.text")
par.ylab.text <- trellis.par.get("par.ylab.text")
par.xlab.text <- trellis.par.get("par.xlab.text")
axis.text$cex <- 1.5
par.ylab.text$cex <- 1.5
par.xlab.text$cex <- 1.5
trellis.par.set("axis.text", axis.text)
trellis.par.set("par.ylab.text", par.ylab.text)
trellis.par.set("par.xlab.text", par.xlab.text)

Perhaps this can be done more efficiently -- I'm far from a trellis
whiz -- but the above should work.

More generally, in designing the plot method for effect objects, it
wasn't my goal to produce publication-quality plots; for that, I
suggest that you build a custom graph using the information included in
the effect object.

I hope this helps,
 John

On Wed, 24 May 2006 13:24:03 -0400
 Emilie Berthiaume <Emilie.Berthiaume at usherbrooke.ca> wrote:
> 
> 
> I can't seem to be able to change the font size in an effect display.
>  I've
> tried the following:
> 
> > par(cex.lab=4)
> > plot(effect ("alti",reg8), ylab="detection probability")
> 
> and
> 
> > plot(effect ("alti",reg8), ylab="detection probability", cex=4)
> 
> but nothing changes.  Can anyone help me?
> thanks.
> 
> 
> Emilie Berthiaume
> graduate student
> Sherbrooke University
> 2500 boul. de l'Université
> Sherbrooke, Québec
> J1K 2R1 CANADA
> 
> Phone: 1-819-821-8000 poste 2059
> Fax: 1-819-821-8049
> emilie.berthiaume at USherbrooke.ca
> 
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--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/