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Re: Type III sums of squares for an anova with a missing

To: <gulogulo@canopybio.com>, <s-news@lists.biostat.wustl.edu>
Subject: Re: Type III sums of squares for an anova with a missing
From: "Luis Apiolaza" <luis.apiolaza@forestrytas.com.au>
Date: Wed, 24 Sep 2003 09:15:39 +1000
What about using lm rather than aov:
> youranalysis.lm <- lm(....)

and then:
> ssType3(youranalysis.lm)
?

Luis

>>> Brett Lovelace <gulogulo@canopybio.com> 24/09/2003 06:33:29 >>>
I am trying to employ the ssType=3 argument to analyze a split-split 
plot 3 factor ANOVA for which I have a missing cell.  The help file for 
summary.aov that describes the usage of ssType=3 says that an aov or 
aovlist object is required.  When trying to run the aov command for my 
dataset, I get an error that indicates that I cannot use such a command 
with a data frame with missing values. 

How then do I get an aov file to calculate my type III sums of squares 
if I cannot run the aov command with missing values?  Any help would be 
greatly appreciated.



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