R help - Jun 2011 - Factor Analysis/Inputting Correlation Matrix

Can someone please direct me to how to run a factor analysis in R by first
inputting a correlation matrix? Does the function "factanal" allow one
to read a correlation matrix instead of data vectors?

Thanks, 
Matt. 

	[[alternative HTML version deleted]]

Hi Matt,

Did you try reading the documentation for factanal()?  You can pull it
up by typing: help("factanal")

These give basically identical results using the raw data, the
covariance matrix, and the correlation matrix.

factanal(x = mtcars, factors = 3)
factanal(factors = 3, covmat = cov(mtcars))
factanal(factors = 3, covmat = cor(mtcars))

all of which is clearly, explained if you read the details for the
argument "covmat" in the help.

Cheers,

Josh

On Sat, Jun 11, 2011 at 3:06 PM, Matt Stati <mattstati at yahoo.com>
wrote:
> Can someone please direct me to how to run a factor analysis in R by first
inputting a correlation matrix? Does the function "factanal" allow one
to read a correlation matrix instead of data vectors?
>
> Thanks,
> Matt.
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>


-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/

ey man!!

you need to change the format of your data as matrix


data <- as.matrix(correlation_data) 

solucion <- factanal(covmat = data, factors=2)

that?s all!!!

enjoy

Rafael Ch.

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