Dear Martin,
The plot you refer to is a scree plot.
One option (there are many) is to have a look at the nFactors package.
Despite its package description, it includes the function plotnScree.
You will find it helpful to search google for "scree plot R" and/or
use rseek.org as there are many possibilities.
Good luck.
Best wishes,
Mark
On 13/03/2008, Martin Kaffanke <technik at roomandspace.com>
wrote:> Hi there!
>
> To make a good choice for the estimation of the number of usefull
> factors. And I'd like to plot a graph like:
>
> http://de.wikipedia.org/wiki/Bild:Parallelanalyse.jpg
>
> where I don't need the green line (random values).
>
> But with
>
> str(factanal(data, factors=10)) I cannot figure out where I can find the
> values for plotting.
>
> Can you please help me in this question?
>
> Thanks,
> Martin
>
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--
Dr. Mark Wardle
Specialist registrar, Neurology
Cardiff, UK