Alpha and mean inter item correlation

Posted by flint on Oct 23, 2012; 4:24am
URL: http://spssx-discussion.165.s1.nabble.com/Alpha-and-mean-inter-item-correlation-tp5715788.html

Hi
I am currently using SPSS. I am a novice. I have two set of survey done in Stage 1 of my research and after 3 months the same survey was done in Stage 2.

I did an exploratory factor analysis but that was thrown out because I have grouped the variables in a theme which my Supervisor said that cannot be done. EFA can only be done with about 10 to 20 variables and not 4 to 5 variables.

Now he told me that I need to do an alpha and mean inter item correlation. I can navigate and manage to do this, alpha and mean inter item correlation. My question is do I put both stages of the survey or only 1 stage of the survey result? There are 69 variables and my participants = 157.

The result as shown from the output was participants 314 (this means they took both stages/I fed in both stages) with 69 varibles. Does it matter? whether its 1 stage or 2 stages, will the result varies?

Thanks.

Flint