[R] compute Mcdonald's omega ω

[William Revelle]

Dear "codecat"

You can get the most recent version of psych from CRAN.  The current version is 1.2.4.

Then, the help page for omega should be of use

library(psych)
?omega

In addition, try the vignette for the psych package.

Or, as of today, there is a more detailed instruction for newbies on using the psych package and R to find omega

http://personality-project.org/r/tutorials/R_for_omega.pdf

Let me know if any of this helps.

Bill


On Jun 10, 2012, at 4:00 PM, codec cat wrote:

> Dear all
> 
> I am a newbie to R and I would appreciate it very much if someone can
> give me some advice on this.
> 
> Please note that I am not a programmer so some of the questions might
> sound really stupid.
> 
> 
> I would like to compute McDonald's omega calculation using R, I'm
> aware I can use the omega function in the psych package.
> 
> But I'm really not sure how to do it.
> 
> 
> I have read these two articles that explain about omega-
> 
> 
> http://personality-project.org/r/html/omega.html and
> http://personality-project.org/r/r.omega.html
> 
> 
> But I'm still not sure how to do it.
> 
> 
> Can someone correct me what I have gone wrong.
> 
> 
> I'm following the instruction from this site and I have downloaded the
> psych package- http://personality-project.org/r/
> 
> 
> *1. Load and read the data*
> 
> 
> datafilename <- file.choose()     # use the OS to find the file
> 
> person.data  <- read.table(datafilename,header=TRUE)  #read the data file
> 
> 
> 
> *2. Use the code examples from http://personality-project.org/r/r.omega.html*
> 
> 
> Copy and paste the whole code from this website in the R console
> 
> 
> 
> I know I must have understood Step 2 incorrectly, but I am really not
> sure what to do with the omega function.
> 
> 
> Can someone give me more specific help on this please.
> 
> 
> Thanks.
> 
> 	[[alternative HTML version deleted]]
> 
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> 

William Revelle		           http://personality-project.org/revelle.html
Professor			           http://personality-project.org
Department of Psychology   http://www.wcas.northwestern.edu/psych/
Northwestern University	   http://www.northwestern.edu/
Use R for psychology             http://personality-project.org/r
It is 5 minutes to midnight	   http://www.thebulletin.org