[R] omega vs. alpha explanation
R. Michael Weylandt
michael.weylandt at gmail.com
Wed Oct 10 16:50:42 CEST 2012
Your subject line also suggests you might consult with your local priest. ;-)
On Wed, Oct 10, 2012 at 2:51 PM, Bert Gunter <gunter.berton at gene.com> wrote:
> Do not post here. This does not appear to be an R question. Post to a
> statistics list like stats.stackexchange.com instead.
> -- Bert
> On Wed, Oct 10, 2012 at 6:42 AM, codec cat <v.codecat at gmail.com> wrote:
>> Dear all
>> I wonder if someone can explain what is the main difference between omega
>> and alpha reliabilities?
>> I understand an omega reliability is based on hierarchical factor model as
>> shown in this graph<http://rgm2.lab.nig.ac.jp/RGM_results/psych:omega.graph/omega.graph_002_big.png>,
>> alpha uses average inter-item correlations.
>> 1. What I don't understand is, in what condition, omega reliability
>> coefficient would be higher than alpha coefficient, and vice versa?
>> 2. Can I assume if the correlations between the subfactors and the
>> variables are higher, the omega coefficient would also be higher (as shown
>> in the omega graph<http://rgm2.lab.nig.ac.jp/RGM_results/psych:omega.graph/omega.graph_002_big.png>
>> Any advice is appreciated!
>> [[alternative HTML version deleted]]
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> Bert Gunter
> Genentech Nonclinical Biostatistics
> Internal Contact Info:
> Phone: 467-7374
> R-help at r-project.org mailing list
> 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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