[R] What are the return values of aov?

[David Winsemius]

On Sep 14, 2009, at 5:29 PM, Peng Yu wrote:

> Hi,
>
> I get the following variables. Instead of guessing what they mean, is
> there a centralized location in R help() that describes their meaning
> and usage?
>
>> names(afit)
> [1] "coefficients"  "residuals"     "effects"       "rank"
> [5] "fitted.values" "assign"        "qr"            "df.residual"
> [9] "contrasts"     "xlevels"       "call"          "terms"
> [13] "model"

Probably not. Neither the help pages nor the R-help mailing list are  
set up to teach you even basic statistics much less all of the  
concepts needed to understand the reasons for creating all of items.  
Buy yourself some books and start reading. The text which for many  
years was the only source was "Modern Applied Statistics with S" and  
if you had some grounding in basic statistics it might be one place,  
but I'm guessing you might want to start with something more basic.

[76] William N. Venables and Brian D. Ripley. Modern Applied  
Statistics with S. Fourth Edition

There are quite a few other texts that have come out in the last few  
years:

http://www.r-project.org/doc/bib/R-books.html

Perhaps:
[32] Peter Dalgaard. Introductory Statistics with R.

My favorite is Harrell's,  "Regression Modeling Strategies", but it's  
not an introductory text and it's not really designed to teach R/S+.

You might also look at:
http://cran.r-project.org/other-docs.html

-- 
David.

>
> On Mon, Sep 14, 2009 at 4:01 PM, Jorge Ivan Velez
> <jorgeivanvelez at gmail.com> wrote:
>> Hi Peng,
>> Try
>> names( your_aov_object )
>> str( your_aov_object )
>> HTH,
>> Jorge
>>
>>
>> On Mon, Sep 14, 2009 at 4:58 PM, Peng Yu <pengyu.ut at gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> I don't quite understand what are the return values of aov. I know
>>> that it has 'coefficients'. But I need to know what all the other
>>> return values are. Can somebody let me know how to figure them?
>>>
>>> Value:
>>>
>>>     An object of class 'c("aov", "lm")' or for multiple responses of
>>>     class 'c("maov", "aov", "mlm", "lm")' or for multiple error  
>>> strata
>>>     of class '"aovlist"'.  There are 'print' and 'summary' methods
>>>     available for these.
>>>
>>>
>>> Regards,
>>> Peng
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT