R help - Oct 2008 - R squared value for a line on a plot

Does anyone know how to retrieve the R squared value for a line on a graph?

Thanks
Georgina

Georgina Sarah Humphreys <g.humphreys.1 <at> research.gla.ac.uk>
writes:
> 
> Does anyone know how to retrieve the R squared value for a line on a graph?
> 
> Thanks
> Georgina
> 
  We need a LOT more information to answer your question ...
please read the posting guide and tell us in a bit more
detail what you're trying to do.  It sounds like you
have a graphical figure of a regression line in a paper
and want to know the R^2, which is basically impossible
unless you have the original data, or unless the plot
shows the data points and you can retrieve by digitizing
(look for the g3data software tool).

  Ben Bolker

Georgina Sarah Humphreys <g.humphreys.1 <at> research.gla.ac.uk>
writes:
> 
> Does anyone know how to retrieve the R squared value for a line on a graph?
The balloon rule

http://www.jstor.org/pss/2683562

Dieter