Date:         Thu, 15 Jul 2010 06:53:06 -0700
Reply-To:     Bruce Weaver <bruce.weaver@hotmail.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Bruce Weaver <bruce.weaver@hotmail.com>
Subject:      Re: How are Polynomial contrasts computed
In-Reply-To:  <AANLkTikKn0e5eMEsf5kSf-BRmTScaNtsASdQfSVzb5Gg@mail.gmail.com>
Content-Type: text/plain; charset=us-ascii

William Dudley WNDUDLEY wrote:
>
> I am struggling with a repeated measures model in which I have run growth
> curve analyses AND repeated measures ANOVA.
> In both the growth curve model and ANOVA model I obtain significant linear
> and quadratic terms.
> I understand what the terms mean in the growth model but I do not
> understand
> how the contrasts are arrived at  in the ANOVA
>
>
> Can someone enlighten me?
>

If you're asking where the sums of squares for the linear and quadratic
contrasts come from, they are linear combinations of the means, with
coefficients taken from a table of Orthogonal Polynomial Coefficients, like
this one:

   http://www.gseis.ucla.edu/courses/help/op.html

But I'm not sure if this is what you are driving at.



-----
--
Bruce Weaver
bweaver@lakeheadu.ca
http://sites.google.com/a/lakeheadu.ca/bweaver/

"When all else fails, RTFM."

NOTE: My Hotmail account is not monitored regularly.
To send me an e-mail, please use the address shown above.

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