[R] Heeeeeelp! Estimatet Marginal Means of ANOVA needed!

Liaw, Andy andy_liaw at merck.com
Mon Jan 5 20:06:20 CET 2004

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,

> 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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