On Jul 7, 2010, at 10:19 AM, Michael Friendly wrote:
Tal Galili wrote:
Hello David,
Thanks to your posting I started looking at the function in the arm
package.
It appears this function is quite mature, and offers (for example)
the
ability to easily overlap coefficients from several models.
I updated the post I published on the subject, so at the end of it
I give an
example of comparing the coef of several models:
http://www.r-statistics.com/2010/07/visualization-of-regression-coefficients-in-r/
Thanks again for the pointer.
Best,
Tal
Achim Zeileis wrote:
Re: more mature. arm's coefplot() is more flexible in certain
respects, mine is more convenient in others. The overlay
functionality is something arm's coefplot() is better in and it
also as some further options (vertical vs. horizontal etc.). My
coefplot() has the advantage that it does not need any modification
as long as coef() and vcov() methods are available. Furthermore,
"level" can specify the significance level (instead of always using
one and two standard errors, respectively).
But it shouldn't be too hard to create a superset of all options.
@Tal:
For the example using library(arm) and the Mroz data, you posted the
wrong image. And loose the intercept in the example.
@Achim:
It would be worthwhile combining the generality of your version with
the
overlay capability of the arm version, which is extremely useful for
model comparison. However, the arm version uses S4 methods.
To my reading coefplot <somehow> collects parameters from a list of
model objects using S4 methods, but then passes these to
coefplot.default which uses base graphics. There seems to be an
implicit loop, ... perhaps some sort of S4 magic? ... that accumulates
like-named coefficients in a .local(...) (function?) object until they
all get reduced to class "numeric", at which point they are passed to
coefplot.default() which does not appear to be an S4 method.
(I am not particularly knowledgeable about S4 functions and
dispatching, so any corrections or applifications to this account
would be welcome.)
--
David.
-Michael
--
Michael Friendly Email: friendly AT yorku DOT ca
Professor, Psychology Dept.
York University Voice: 416 736-5115 x66249 Fax: 416 736-5814
4700 Keele Street Web: http://www.datavis.ca
Toronto, ONT M3J 1P3 CANADA
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