Dear Katrina,

You might look to the Anova() function (capital "A") in the "car"  
library by John Fox; it does Type II SS. There a few other helpful  
functions to streamline analyses and make pretty pictures.

Best,

Jesse


Dept. of Environmental and Forest Biology, SUNY-ESF
248 Illick Hall, 1 Forestry Dr., Syracuse, NY 13210 USA
phone: 315.470.4937   fax: 315.470.6934   email: jbrunner@esf.edu
http://www.esf.edu/efb/brunner/

> Message: 2
> Date: Thu, 13 Nov 2008 10:08:46 +0100
> From: "ONKELINX, Thierry" <Thierry.ONKELINX@inbo.be>
> Subject: Re: [R-sig-eco] ANOVA Output
> To: <katrina.chu@unb.ca>, <r-sig-ecology@r-project.org>
> Message-ID:
>         <2E9C414912813E4EB981326983E0A10405B7AEEB@inboexch.inbo.be>
> Content-Type: text/plain;       charset="us-ascii"
>
> Dear Katrina,
>
> The F-value are different because you test different hypotheses since
> anova yields Type I SS. It looks like you expect Type III SS.
>
> HTH,
>
> Thierry
>
>
> ------------------------------------------------------------------------
> ----
> ir. Thierry Onkelinx
> Instituut voor natuur- en bosonderzoek / Research Institute for Nature
> and Forest
> Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
> methodology and quality assurance
> Gaverstraat 4
> 9500 Geraardsbergen
> Belgium
> tel. + 32 54/436 185
> Thierry.Onkelinx@inbo.be
> www.inbo.be
>
> To call in the statistician after the experiment is done may be no  
> more
> than asking him to perform a post-mortem examination: he may be able  
> to
> say what the experiment died of.
> ~ Sir Ronald Aylmer Fisher
>
> The plural of anecdote is not data.
> ~ Roger Brinner
>
> The combination of some data and an aching desire for an answer does  
> not
> ensure that a reasonable answer can be extracted from a given body of
> data.
> ~ John Tukey
>
>> -----Oorspronkelijk bericht-----
>> Van: r-sig-ecology-bounces@r-project.org
>> [mailto:r-sig-ecology-bounces@r-project.org] Namens Katrina W. Chu
>> Verzonden: woensdag 12 november 2008 22:27
>> Aan: r-sig-ecology@r-project.org
>> Onderwerp: [R-sig-eco] ANOVA Output
>>
>> I have a question about my R-output when I run a three-way ANOVA.  I
>> just plugged in the
>> interaction term into the formula and presto!  ANOVA!  But I noticed
>> that if I change
>> the order of the formula (or interaction term), I get slightly  
>> different
>> ANOVA outputs.
>>  I've pasted the output at the bottom of this message.  I didn't  
>> think
>> that this should
>> happen, so I would appreciate if anyone had any feedback on this
>> problem.
>>
>> Thanks in advance, Kat.







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