[R] Question about the "effects" package

John Fox jfox at mcmaster.ca
Sat Nov 13 16:50:10 CET 2010

Dear Shige,

As documented in ?plot.eff, the default is to plot on the scale of the
linear predictor (the logit scale, for a logit model), which preserves the
linearity of the model (which, I would think, is generally desirable), but
to label the axis on the scale of the response (the probability scale). As
is also documented, setting rescale.axis=FALSE will plot on the scale of the

I hope this helps,

John Fox
Senator William McMaster 
  Professor of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
web: socserv.mcmaster.ca/jfox

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
> Behalf Of Shige Song
> Sent: November-13-10 10:14 AM
> To: r-help Help
> Subject: [R] Question about the "effects" package
> Dear All,
> I am using the "effects" package to produce predicted probability from
> a logistic regression. The graph looks really good. I soon realized
> that the y-axis is not spaced equally. For example, in my case, the
> distance between 0.02 and 0.04 is much greater than that between 0.06
> and 0.08. I can guess a reason for this, but unfortunately, this
> distorts my story. Is there a way to change this and make the y-axis
> equally spaced?
> Many thanks.
> Best,
> Shige
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