Hi Shatha,
There is a function built into the core packages that lets you easily
extract coefficients. See the documentation for ?coef
For the standard errors, you can extract them from a model object
yourself, but that can be a bit of a pain. An alternative is to use
se.coef from package "arm".
install.packages("arm")
require(arm)
?se.coef
As to how you actually do the calculations once you have the needed
data, that is up to you.
HTH,
Josh
On Fri, Apr 22, 2011 at 3:30 PM, Shatha Omar <shathaom...@gmail.com> wrote:
> Dear,
>
> i am a student and I need help in comparing between different slopes and
> finding whther there is a significant difference between them?
>
> Thanks a lot
>
> [[alternative HTML version deleted]]
>
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>
--
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/
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