[R] Storing CA Results to a Data Frame?

[Vik Rubenfeld]

Thanks very much for this great info, Ista.

Best,


-Vik

On Sep 26, 2010, at 12:10 PM, Ista Zahn wrote:

> Hi Vik,
> I suggest reading through some of the introductory documentation. R
> has several classes of objects, including matrix, list, data.frame
> etc. and a basic understanding of what these are is essential for
> effectively using R. An essential function is str() which shows you
> the structure of an object. Other essential functions include names(),
> help(), help.search(), and methods()
> 
> An example session that is similar to your case:
> 
> library(ca) # load the ca package
> data(author) # load the authors dataset
> str(author) # examine the authors data
> auth.ca <- ca(author) # run the ca function on the authors data
> str(auth.ca) # examin the structure of the auth.ca results. Note that
> it is a list with class of "ca"
> methods(class=class(auth.ca)) # see what methods are defined for this
> type of object
> ?plot.ca ## look up the documentation for the plot method for objects
> of class "ca"
> plot(auth.ca) ## call the plot method
> auth.ca.sum <- summary(auth.ca) ## call the summary method
> str(auth.ca.sum) # examine the structure of the auth.ca.sum object
> methods(class=class(auth.ca.sum)) ## find out what methods are defined for it
> ## Hmmn ok, so suppose I want to extract the "rows" and "columns"
> data.frames from auth.ca.sum but don't know how
> help.search("extract") ## first result is base::Extract
> ?Extract ## look up documentation for extract
> auth.ca.rows <- auth.ca.sum[["rows"]] ## extract the "rows" data.frame
> auth.ca.rows <- auth.ca.sum[["columns"]] ## extract the "columns" data.frame
> write.csv(auth.ca.rows) ## write results to a .csv file
> write.csv(auth.ca.rows) ## ""
> 
> HTH,
> Ista
> 
> On Sun, Sep 26, 2010 at 6:10 PM, Vik Rubenfeld <vikr at mindspring.com> wrote:,
>> I am successfully performing a correspondence analysis using the commands:
>> 
>>        NonLuxury <- read.table("/Users/myUserName/Desktop/nonLuxury.data.txt")
>>        ca(NonLuxury)
>> 
>> I would like to store the results to a data frame so that I can write them to disk using write.table.  I have tried several things such as:
>> 
>>        df <- data.frame(ca(NonLuxury))
>>        df <- data.frame(data(ca(NonLuxury)))
>>        etc.
>> 
>> ...but clearly this is incorrect as it generates an error message.
>> 
>> Is it possible to store the results of a CA to a dataframe, and if so, what is the correct way to do this?
>> 
>> Thanks in advance to all for any info.
>> 
>> 
>> -Vik
>> ______________________________________________
>> 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.
>> 
> 
> 
> 
> -- 
> Ista Zahn
> Graduate student
> University of Rochester
> Department of Clinical and Social Psychology
> http://yourpsyche.org