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>,
 and
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!

Thanks.

	[[alternative HTML version deleted]]

