[R] Extracting Element from S4 objects

[David Winsemius]

On May 2, 2009, at 6:30 PM, tbigdeli wrote:

>
> Good point, I've updated since.
>
> Now, would solutions be specific to newer versions?

Who knows? I was just saying there might be difficulties in getting  
anyone to actually test the specifics of your question.

>  I need to make a
> numerical comparison upon each iteration of independence_test().

So you are probably referring to the coin package?

> With
> chisq.test(), etc the output is as.list().

The output from what?

>  I imagine this difference is a
> reflection of the author's coding preferences.

The code is available. After package(coin), methods(independence_test)  
reports three methods and  
getAnywhere(independence_test.IndependenceProblem) produces the code  
that does the dispatching to other specific methods. There are, of  
course, methods for extracting components of S4 objects. If you post  
the code that you are using, then people may have answers to questions  
which at the moment are highly non-specific.

>
>
> Now, I could code a Cochran-Armitage trend test but that wouldn't do  
> our
> great support community justice now, would it? :)

Now that is a bit elliptical, isn't it? If you want to see how Agresti  
and Thompson might to it, consult page  81 of "R (and S-PLUS) Manual  
to Accompany Agresti’s Categorical Data Analysis (2002) 2nd edition"
Laura A. Thompson, 2007:
https://home.comcast.net/~lthompson221/Splusdiscrete2.pdf

-- 
David.

>
>
>
>
> David Winsemius wrote:
>>
>> I don't think very many of us have a version that is quite that old.
>>
>> Sorry;
>> David.
>>
>> On Apr 29, 2009, at 4:37 PM, tbigdeli wrote:
>>
>>>
>>> Are there internal methods available for R2.6 (I'm using the mac os
>>> x gui)
>>> for extracting (or subsetting) S4 objects?
>>>
>>> Using the independence_test() function implemented in the COIN
>>> package, I
>>> can't seem to select out p-values upon completion of each iteration
>>> of a
>>> loop.
>>>
>>> Sorry if my search was incomplete beforehand.
>>> -- 
>>
>>
>> David Winsemius, MD
>> Heritage Laboratories
>> West Hartford, CT
>>
>> ______________________________________________
>> 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.
>>
>>
>
> -- 
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>
> ______________________________________________
> 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