Re: [R] statistic Q

From: Joshua Wiley <jwiley.psych_at_gmail.com>
Date: Fri, 22 Apr 2011 17:46:40 -0700

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 <shathaomar2_at_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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Received on Sat 23 Apr 2011 - 00:48:24 GMT

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