I'm examining a questionnaire believed to have two-factors (7 items on each variable) from previous Exploratory Factor Analysis. Looking at it using Confirmatory Factor Analysis (CFA), the fit is rather poor (RMSEA around .10; CFI around .90). So now I'm going to examine the modification indices, but I wonder whether I should:
- Examine the modification indices in the two-factor model, OR
- Examine the CFA models of each of the two variables independently first and their modification indices (and potentially remove/adjust items to fit the two independent CFA models first); and then when the two variables have a good fit examine the two-factor solution and potentially remove/adjust items.
Lastly, does anyone have any good reference for any of these approaches.
Any help is much appreciated, Gorp.