R help - Jan 2004 - Heeeeeelp! Estimatet Marginal Means of ANOVA needed!

Hello!

I urgently need to know if it is possible (and if so, how to do) to get 
the "Estimatet marginal means" from an ANOVA.
Or explained more coplicated: It's about plants sewn in 2 densities & 2 
patterns. The Variable is biomass and I also use a Covariate. There are highly 
significant differences between density & pattern but I don't know which
of the
2 densities gives the higher biomass values.
I would like to get something analoge to the "Estimatet Marginal
Means" you get
with SPSS.
Who can help me as soon as possible?

Thanks
Deborah Renz


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Have you considered feeding the ANOVA fit to "predict"?  A second 
alternative might be "tapply".  hope this helps.  spencer graves

Deborah.Renz at stud.unibas.ch wrote:
>Hello!
>
>I urgently need to know if it is possible (and if so, how to do) to get 
>the "Estimatet marginal means" from an ANOVA.
>Or explained more coplicated: It's about plants sewn in 2 densities
& 2
>patterns. The Variable is biomass and I also use a Covariate. There are
highly
>significant differences between density & pattern but I don't know
which of the
>2 densities gives the higher biomass values.
>I would like to get something analoge to the "Estimatet Marginal
Means" you get
>with SPSS.
>Who can help me as soon as possible?
>
>Thanks
>Deborah Renz
>
>
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>
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>  
>

I've never used SPSS, so don't know what it refers to as "estimated
marginal
means".  However, my guess is that they are probably what SAS calls LS
(least squares) means.  I know Prof. Yandell has written a lsmeans()
function for his "pda" package (supporting his book, "Practical
Data
Analysis for Designed Experiments") which you can find on his web page.

Hope this helps,
Andy
> From: Deborah.Renz at stud.unibas.ch
> 
> Hello!
> 
> I urgently need to know if it is possible (and if so, how to 
> do) to get 
> the "Estimatet marginal means" from an ANOVA.
> Or explained more coplicated: It's about plants sewn in 2 
> densities & 2 
> patterns. The Variable is biomass and I also use a Covariate. 
> There are highly 
> significant differences between density & pattern but I don't 
> know which of the 
> 2 densities gives the higher biomass values.
> I would like to get something analoge to the "Estimatet 
> Marginal Means" you get 
> with SPSS.
> Who can help me as soon as possible?
> 
> Thanks
> Deborah Renz

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Dear Deborah,

The effects package may do what you want.

John

At 06:27 PM 1/5/2004 +0100, Deborah.Renz at stud.unibas.ch wrote:
>Hello!
>
>I urgently need to know if it is possible (and if so, how to do) to get
>the "Estimatet marginal means" from an ANOVA.
>Or explained more coplicated: It's about plants sewn in 2 densities
& 2
>patterns. The Variable is biomass and I also use a Covariate. There are 
>highly
>significant differences between density & pattern but I don't know
which
>of the
>2 densities gives the higher biomass values.
>I would like to get something analoge to the "Estimatet Marginal
Means"
>you get
>with SPSS.
>Who can help me as soon as possible?
>
>Thanks
>Deborah Renz
____________________________
John Fox
Department of Sociology
McMaster University
email: jfox at mcmaster.ca
web: http://www.socsci.mcmaster.ca/jfox