[R] Factor Analysis/Inputting Correlation Matrix

[Joshua Wiley]

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