- Thread starter Alexis Newton
- Start date

Below are some articles I found on google.

Factor Analysis Using SPSS

http://www2.chass.ncsu.edu/garson/pa765/factor.htm

http://www2.chass.ncsu.edu/garson/pa765/factor.htm

How does it matter in statistics or SPSS whether I want to do exploratory or confirmatory analysis? Actually I had about 30 items (40 patients) measuring a chance to be predisposed to some psychatric or neurologic disorders. And we know which items we want to include to extract several factors. We are not using all the items. We want to make sure that we are making the right decision about which items go together to make a factor or factors.

In confirmatory factor analysis, you know what the factors are, and you want to confirm it with a follow-on study.

Just a comment - a sample size of 40 is not nearly enough for factor analysis. The basic rule of thumb is a sample size of 10 per original variable - so if you have 30 variables, you need at least a sample of 300.